Toán a) 3/14 x – 1/4 = 2(x – 3) + 1/4 x b) 30\%x-x+ 5 6 = 1 3 cần gấp nhé ???? 19/07/2021 By Margaret a) 3/14 x – 1/4 = 2(x – 3) + 1/4 x b) 30\%x-x+ 5 6 = 1 3 cần gấp nhé ????
a) `3/14 x – 1/4 = 2(x-3) + 1/4x` `=> 3/14 x – 1/4 = 2x -6 + 1/4x` `=> 3/14 x – 2x – 1/4 x = -6 + 1/4` `=> (3/14 -2-1/4) x = -23/4` `=>-57/28 x = -23/4` `=> x= (-23/4) : (-57/28)` `=> x= -23/4 . (-28/57)` `=> x= 161/57` Vậy `x= 161/57` b) `30% x – x +5/6 = 1/3` `=> 3/10 x – x = 1/3 – 5/6` `=> (3/10 -1) x = -1/2` `=> -7/10 x = -1/2` `=> x= -1/2 : (-7/10)` `=> x= -1/2 . (-10/7)` `=> x=5/7` Vậy `x= 5/7` Trả lời
`a//` `3/14x – 1/4 = 2(x-3) + 1/4x` `⇒ 3/14x – 1/4 = 9/4x – 6` `⇒ 3/14x = -23/4 + 9/4x` `⇒ -57/28x = -23/4` `⇒ -57x = -161` `⇒ x = 161/57` Vậy `x = 161/57` `b//` `30%x – x + 56 = 13` `⇒ 3/10x – x + 56 = 13` `⇒ 3/10x – x = -43` `⇒ -7x = -430` `⇒ x = 430/7` Vậy `x = 430/7` Trả lời