Tìm số hữu tỉ x biết: -3/2 – 2x + 3/4=-2 29/07/2021 Bởi Eloise Tìm số hữu tỉ x biết: -3/2 – 2x + 3/4=-2
$-\dfrac{3}{2}-2x+\dfrac{3}{4}=-2$ $-2x-\dfrac{3}{4}=-2$ $-2x=-2+\dfrac{3}{4}$ $-2x=-\dfrac{8}{4}+\dfrac{3}{4}$ $-2x=-\dfrac{5}{4}$ $→x=-\dfrac{5}{4}:(-2)=-\dfrac{5}{4}.(-\dfrac{1}{2})$ $→x=\dfrac{5}{8}$ Bình luận
Đáp án: ` -3/2 – 2x + 3/4=-2` `⇔ -2x =-2 – 3/4 + 3/2` `⇔ -2x = -8/4 – 3/4 + 6/4` `⇔ -2x = -5/4` `⇔ x = 5/8` Vậy `x=5/8`. Bình luận
$-\dfrac{3}{2}-2x+\dfrac{3}{4}=-2$
$-2x-\dfrac{3}{4}=-2$
$-2x=-2+\dfrac{3}{4}$
$-2x=-\dfrac{8}{4}+\dfrac{3}{4}$
$-2x=-\dfrac{5}{4}$
$→x=-\dfrac{5}{4}:(-2)=-\dfrac{5}{4}.(-\dfrac{1}{2})$
$→x=\dfrac{5}{8}$
Đáp án:
` -3/2 – 2x + 3/4=-2`
`⇔ -2x =-2 – 3/4 + 3/2`
`⇔ -2x = -8/4 – 3/4 + 6/4`
`⇔ -2x = -5/4`
`⇔ x = 5/8`
Vậy `x=5/8`.