Question

Bai: Tim x bang cach hop ly :

a)\(\frac{-5}{1,2}=\frac{x}{-4,8}\)

b) \((\frac{x}{5})^2=\frac{9}{25}\)

Answer 1

\(\frac{-5}{1,2}=\frac{x}{-4,8}=>-5.-4,8=1,2.x\)

=> 24 = 1,2x

=> 24 : 1,2 = x

=> 20 = x

Answer 2

\(\left(\frac{x}{5}\right)^2=\frac{9}{25}=>\left(\frac{x}{5}\right)^2=\left(\frac{3}{5}\right)^2\)

=> \(\frac{x}{5}=\frac{3}{5}=>x=3\)

Answer 3

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Answer 4

a) \(\frac{-5}{1,2}=\frac{x}{-4,8}\)

=> \(\left(-5\right).\left(-4,8\right)=x.1,2\)

=> \(24=x.1,2\)

=> \(x=24:1,2\)

=> \(x=20\)

Vậy \(x=20.\)

b) \(\left(\frac{x}{5}\right)^2=\frac{9}{25}\)

=> \(\left(\frac{x}{5}\right)^2=\left(\frac{3}{5}\right)^2\)

=> \(\frac{x}{5}=\frac{3}{5}\)

=> \(x.5=3.5\)

=> \(x.5=15\)

=> \(x=15:5\)

=> \(x=3\)

Vậy \(x=3.\)

Chúc bạn học tốt!

Answer 5

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