七年级一元一次方程题

题目

七年级一元一次方程题
20%+(1-20%)(320-x)=320×40%
2(x-2)+2=x+1
2(x-2)-3(4x-1)=9(1-x)
x/3 -5 = (5-x)/2
2(x+1) /3=5(x+1) /6 -1
(1/5)x +1 =(2x+1)/4
(5-2)/2 - (4+x)/3 =1
x/3 -1 = (1-x)/2
(x-2)/2 - (3x-2)/4 =-1
11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)

答案

20%+(1-20%)(320-x)=320×40%0.2+0.8*(320-x)=1280.8*(320-x)=127.8320-x=159.75x=160.252(x-2)+2=x+12x-4+2=x+12x-2=x+1x=32(x-2)-3(4x-1)=9(1-x) 2x-4-12x+3=9-9x-10x-1=9-9x-x=10x=-10x/3 -5 = (5-x)/2两边同时乘...