Đáp án:
x = $\frac{-87}{140}$
Giải thích các bước giải:
$\frac{2}{3}$ x + $\frac{5}{7}$ = $\frac{3}{10}$
⇒ $\frac{2}{3}$x = $\frac{3}{10}$ - $\frac{5}{7}$ = $\frac{-29}{70}$
⇒ x=$\frac{-29}{79}$ : $\frac{2}{3}$ = $\frac{-87}{140}$
bài làm
x = −87/140
2/3 x + 5/7 = 3/10
⇒ 3/2x = 3/10 - 5/7 = −29/70
⇒ x=−29/79−29/79 : 2/3 = −87/140
nhớ cho 5 sao nhé
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