\(\frac{\sqrt{\sqrt{7}-\sqrt{3}}}{\sqrt{\sqrt{7}-2}}\)-\(\frac{\sqrt{\sqrt{7}+\sqrt{3}}}{\sqrt{\sqrt{7}-2}}\)
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
KQ
0
26 tháng 8 2019
mk......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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..........................................................................................................................................................................................................................................................................................................................................................................................................................................................2k8 :3
bạn có thể vô tìm ở đây
I
I
V
https://olm.vn/hoi-dap#collapseOne
US
2
26 tháng 8 2019
Mik ko biet nhung chi tra loi cho vui thoi : ban vao thong tin xem co ko
DT
2
E
26 tháng 8 2019
áp dụng cách giải pt bậc 2 là xong mà bạn..
đây là bài toán cơ bản nên bạn xem lại SGK
26 tháng 8 2019
\(x^2+16x-225=0\)
\(\Rightarrow x^2-9x+25x-225=0\)
\(\Rightarrow x\left(x-9\right)+25\left(x-9\right)=0\)
\(\Rightarrow\left(x+25\right)\left(x-9\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x+25-0\\x-9=0\end{cases}\Rightarrow\orbr{\begin{cases}x=-25\\x=9\end{cases}}}\)
DL
26 tháng 8 2019
ĐKXD : \(\hept{\begin{cases}x\ne-1\\x\ne-3\end{cases}}\)
\(\left(x+1\right)^4+\left(x+3\right)^4=2x^4+16x^3+60x^2+112x+82=2\)
\(\Rightarrow2\left(x^4+8x^3+30x^2+56x+41\right)=2\)
\(\Rightarrow x^4+8x^3+30x^2+56x+40=0\)
\(\Rightarrow\left(x+2\right)^2\left(x^2+4x+10\right)=0\)
\(\Rightarrow\hept{\begin{cases}\left(x+2\right)^2=0\\x^2+4x+10=0\end{cases}}\)
\(\left(x+2\right)^2=0\Rightarrow x=-2\)
DL
26 tháng 8 2019
Vì sao \(x^2+4x+10=0\)không có nghiệm?
Ta có biệt thức D của phương trình \(\left(x+2\right)^2=0\)trên là \(D=b^2-4ac=4^2-4\cdot1\cdot4=0\)
Vậy \(D=0\)
Tương tự bạn xét biệt thức D của pt x^2 +4x +10 sẽ < 0 nên pt trên không có nghiệm
DL
26 tháng 8 2019
Vì \(\sqrt{17}>\sqrt{15}\)
\(\Rightarrow\sqrt{33}-\sqrt{15}>\sqrt{33}-\sqrt{17}\)
\(\sqrt{36}-\sqrt{15}>\sqrt{33}-\sqrt{15}\Leftrightarrow6-\sqrt{15}>\sqrt{33}-\sqrt{15}\)
Vậy \(6-\sqrt{15}>\sqrt{33}-\sqrt{17}\)vì \(\sqrt{33}-\sqrt{15}>\sqrt{33}-\sqrt{17}\)
NA
0
D
2
26 tháng 8 2019
\(x^3+y^3+z^3=x+y+z+2014\)
\(\Leftrightarrow\left(x^3-x\right)+\left(y^3-y\right)+\left(z^3-z\right)=2014\)
\(\Leftrightarrow x\left(x-1\right)\left(x+1\right)+y\left(y-1\right)\left(y+1\right)+z\left(z-1\right)\left(z+1\right)=2014\)
Ta thấy VT chia hết cho 3 . còn VT không chia hết cho 3
\(\Rightarrow\)vô nghiệm
27 tháng 8 2019
VT chia hết cho 3 còn VP không chia hết cho 3 nhé.sửa lại tí
GV
3
26 tháng 8 2019
dung may tinh la xong thui ban oi
hoac dua len mang giai
chao <>?