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Do |x|=5;|y|=7
\(\Rightarrow x=\orbr{\begin{cases}5\\-5\end{cases};y=\orbr{\begin{cases}7\\-7\end{cases}}}\)
TH1:x=5;y=7
=>x + y = 12
x - y = -2
TH2:x=5;y=-7
=>x+y=-2
x-y=12
TH3:x=-5;y=7
=>x+y=2
x-y=-12
TH4:x=-5;y=-7
=>x+y=-12
x-y=2.
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ta co :x /4 =3 suy ra x =3 .4 =12
21 /x =7 suy ra x= 21 :7 =3
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\(-\frac{1}{10}< =x< =\frac{3}{5}\)
\(\frac{-4}{9}< x< =\frac{2}{3}\)
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a) 2/3x +1/2 = 1/10
=> 2/3x = 1/10 - 1/2
2/3x = -2/5
=> x = -2/5 : 2/3
x = -3/5
b) (4,5 - 2x) : 3/4 = \(1\frac{1}{3}=\frac{4}{3}\)
=> 4,5 - 2x = 4/3 x 3/4
4,5 - 2x = 1
-2x = 4,5 - 1
-2x = 3,5
=> x = 3,5 : (-2)
x = - 1,75
c) x/4 = 5/20
=> x = 5/20 x 4
x = 1
d) ?????
2/3x+1/2=1/10
<=>2/3x=1/10-1/2
<=>2/3x=-2/10
=>x=-2/10 chia 2/3=-3/10
ý kia tương tự
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a)\(3.3.3.4.4.4=3^3.4^3=12^3\)
b)\(a.a.a+b.b.b.b=a^3+b^4\)
Chúc hk tốt nha!!!
\(\frac{3}{5}x-x=\frac{-4}{15}\)
\(\Rightarrow\left(\frac{3}{5}-1\right)x=\frac{-4}{15}\)
\(\Rightarrow\frac{-2}{5}x=\frac{-4}{15}\)
\(\Rightarrow x=\frac{-4}{15}:\frac{-2}{5}=\frac{2}{3}\)
\(\text{vậy x=}\frac{2}{3}\)
\(\frac{3}{5}x-x=-\frac{4}{15}\)
\(\Leftrightarrow-\frac{2}{5}x=-\frac{4}{15}\)
\(\Leftrightarrow x=\left(\frac{-4}{15}\right):\left(-\frac{2}{5}\right)=\frac{2}{3}\)