a, |x+3| = 0
b, |x+1|= 10
c, | x-5 | = (-5) + 8
*GIÚP MÌNH VỚI * ( ai nhanh và đúng cho 1 like )
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, 7\(\dfrac{3}{5}\) : \(x\) = 5\(\dfrac{4}{15}\) - 1\(\dfrac{1}{6}\)
\(\dfrac{38}{5}\) : \(x\) = \(\dfrac{79}{15}\) - \(\dfrac{7}{6}\)
\(x\) = \(\dfrac{41}{10}\)
\(x\) = \(\dfrac{38}{5}\) : \(\dfrac{41}{10}\)
\(x\) = \(\dfrac{76}{41}\)
b, \(x\) \(\times\) 2\(\dfrac{2}{3}\) = 3\(\dfrac{4}{8}\) + 6\(\dfrac{5}{12}\)
\(x\) \(\times\) \(\dfrac{8}{3}\) = \(\dfrac{7}{2}\) + \(\dfrac{77}{12}\)
\(x\) \(\times\) \(\dfrac{8}{3}\) = \(\dfrac{119}{12}\)
\(x\) = \(\dfrac{119}{12}\)
\(x\) = \(\dfrac{119}{12}\): \(\dfrac{8}{3}\)
\(x\) = \(\dfrac{119}{32}\)
f: Ta có: \(16x^2-9\left(x+1\right)^2=0\)
\(\Leftrightarrow\left(4x-3x-3\right)\left(4x+3x+3\right)=0\)
\(\Leftrightarrow\left(x-3\right)\left(7x+3\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-\dfrac{3}{7}\end{matrix}\right.\)
cau b ta co9;(x+x+.....+x)-(1+2+....+100)=4950
100x - 5050 =4950
100x =4950+5050
100x =10000
x=10000 ;100
x=100
Đặt \(A=\frac{1.2+2.4+3.6+4.8+5.10}{4+6.8+9.12+12.16+15.20}\)
\(\Rightarrow A=\frac{1.\left(1+2\right)+2.\left(1+2\right)+3.\left(1+2\right)+4.\left(1+2\right)+5.\left(1+2\right)}{4+2.\left(3+4\right)+3.\left(3+4\right)+4.\left(3+4\right)+5.\left(3+4\right)}\)
\(\Rightarrow A=\frac{\left(1+2+3+4+5\right).\left(1+2\right)}{4+\left(2+3+4+5\right).\left(3+4\right)}\)
\(\Rightarrow A=\frac{\left(1+5\right).5:2.\left(1+2\right)}{4+\left(2+5\right).4:2.\left(3+4\right)}\)
\(\Rightarrow A=\frac{6.5:2.3}{4+7.4:2.7}=\frac{45}{4+98}=\frac{45}{102}=\frac{15}{34}\)
Vậy \(A=\frac{15}{34}\)
Chúc bn học tốt
[3x-1]5=[3x-1]8
=>[3x-1]8-[3x-1]5=0
[3x-1]5.[[3x-1]3-1]=0
=>[3x-1]5 =0 hoặc [3x-1]3-1=0
=>3x-1=0 hoặc3x-1 =1
=>x=1/3 hoac x=2/3
Vay....
=>
a, |x+3| = 0
x + 3 =0
x = -3
b, |x+1|= 10
TH1: x + 1 = 10
x = 9
Th2: x + 1 = -10
x = -11
c, | x-5 | = (-5) + 8
| x - 5 | = 3
Th1: x-5 = 3
x = 8
Th2: x - 5 = -3
x = 2
hok tốt!!!
a, |x+3| = 0
=> x+3=0
=> x=-3
b, |x+1|= 10
=> \(\orbr{\begin{cases}x+1=10\\x+1=-10\end{cases}}\)
=>\(\orbr{\begin{cases}x=9\\x=-11\end{cases}}\)
c, | x-5 | = (-5) + 8
=> | x-5 | =-13
=> x-5=13
=> x=18
nhé