Question

Tìm x biết:

a) \(\frac{4}{9}+x=\frac{-3}{5}\)

b) \(\frac{2}{5}+\frac{3}{5}\) : \(x=1\frac{7}{10}\)

c) \(40\%x-\frac{3}{5}x=\frac{2}{35}\)

d) \(\left(2x+1\right)^2=49\)

Help me, please!!!

Answer 1

\(c.x\left(\frac{2}{5}-\frac{3}{5}\right)=\frac{2}{35}\)

\(x=\frac{2}{35}:\frac{-1}{5}=-\frac{2}{7}\)

\(d.\left(2x+1\right)^2=49=7^2=\left(-7\right)^2\)

\(TH1:2x+1=7\Rightarrow x=3\)

\(TH2=2x+1=-7\Rightarrow x=-4\)

Answer 2

\(a.x=\frac{-3}{5}-\frac{4}{9}=\frac{-47}{45}\)

\(b.\frac{3}{5}:x=\frac{17}{10}-\frac{2}{5}\)

\(x=\frac{3}{5}:\frac{13}{10}=\frac{6}{13}\)

Answer 3

Mk lộn ở dòng a

\(\frac{4}{9}+x=\frac{-5}{3}\) mới đúng

Answer 4

\(a.x=\frac{-5}{3}-\frac{4}{9}=\frac{-19}{9}\)

- Hok tốt ~~~~~