Tìm x: 2/5:(2x+3/4)=-7/10 Mn giúp mình nha 20/10/2021 Bởi Josie Tìm x: 2/5:(2x+3/4)=-7/10 Mn giúp mình nha
Đáp án: $\text{$\dfrac{2}{5}$ : (2x+$\dfrac{3}{4}$) = $\dfrac{-7}{10}$}$ $\text{<=> 2x + $\dfrac{3}{4}$ = $\dfrac{2}{5}$ : $\dfrac{-7}{10}$}$ $\text{<=> 2x + $\dfrac{3}{4}$ = $\dfrac{-4}{7}$ }$ $\text{<=> 2x = $\dfrac{-4}{7}$ – $\dfrac{3}{4}$ }$ $\text{<=> 2x = $\dfrac{-37}{28}$ }$ $\text{<=> x = $\dfrac{-37}{28}$ : 2 }$ $\text{<=> x = $\dfrac{-37}{56}$ }$ $\text{Vậy x = { $\dfrac{-37}{56}$ } }$ Bình luận
2/5:(2x+3/4)=-7/10 2x+3/4 = 2/5 : -7/10 2x+3/4=-4/7 2x= -4/7 – 3/4 2x=-37/28 x= -37/28 : 2 x= -37/56 Bình luận
Đáp án:
$\text{$\dfrac{2}{5}$ : (2x+$\dfrac{3}{4}$) = $\dfrac{-7}{10}$}$
$\text{<=> 2x + $\dfrac{3}{4}$ = $\dfrac{2}{5}$ : $\dfrac{-7}{10}$}$
$\text{<=> 2x + $\dfrac{3}{4}$ = $\dfrac{-4}{7}$ }$
$\text{<=> 2x = $\dfrac{-4}{7}$ – $\dfrac{3}{4}$ }$
$\text{<=> 2x = $\dfrac{-37}{28}$ }$
$\text{<=> x = $\dfrac{-37}{28}$ : 2 }$
$\text{<=> x = $\dfrac{-37}{56}$ }$
$\text{Vậy x = { $\dfrac{-37}{56}$ } }$
2/5:(2x+3/4)=-7/10
2x+3/4 = 2/5 : -7/10
2x+3/4=-4/7
2x= -4/7 – 3/4
2x=-37/28
x= -37/28 : 2
x= -37/56