Toán . 2 -3 a) — x = — + x . 7 4 . . . . 1 -2 b) x – —- = —- . 2 3 22/07/2021 By Anna . 2 -3 a) — x = — + x . 7 4 . . . . 1 -2 b) x – —- = —- . 2 3
a) 2/7x = -3/4 + x ⇔ 2/7x – x = -3/4 ⇔ -5/7x = -3/4 ⇔ x = -3/4 : (-5/7) ⇔ x = 21/20 Vậy x = 21/20 b) x – 1/2 = -2/3 ⇔ x = -2/3 + 1/2 ⇔ x = -1/6 Vậy x = -1/6 Trả lời
a) `2/7 x=-3/4+x` `⇒ (-3/4+x)÷x=2/7` `⇒ -3/4x+1=2/7` `⇒ -3/4x=-5/7` `⇒ x=21/20` b) `x-1/2=-2/3` `⇒ x=-2/3+1/2` `⇒ -1/6` Trả lời