Toán giúp lm 2 câu này vs: a, x . 3 – 2018 : 2 = 23 b, 280 – x . 9 – x = 80 19/07/2021 By Ayla giúp lm 2 câu này vs: a, x . 3 – 2018 : 2 = 23 b, 280 – x . 9 – x = 80
`a, x . 3 – 2018 : 2 = 23` `x . 3 – 1009 = 23` `x . 3 = 23 + 1009` `x . 3 = 1032` `x = 1032 : 3` `x = 344` `b, 280 – x . 9 – x = 80` `-9x – x = 80 – 280` `-10x = -200` `x = -200 : ( -10 )` `x = 20.` Trả lời
a, x . 3 – 2018 : 2 = 23 x . 3 – 1009 = 23 x . 3 = 23 + 1009 x . 3 = 1032 x = 1032 : 3 x = 344 b, 280 – x . 9 – x = 80 – 9x – x = 80 – 280 – 10x = – 200 x = – 200 : ( – 10 ) x = 20 Trả lời