你的这些题目太多了,都写过程太麻烦。不过这些题目都不难,只牵涉去括号步骤与移项步骤和合并同类项步骤。2(x+3) - 5(1-x) = 3(x-1)
2x+6-5x+5=3x-3 2x-5x-3x=-3-6-5 -6x=-14 x=7/3
4-3(2-x)=5x
4-6+3x=5x 4-6=5x-3x -2=2x x=-1
4x-3(20-x)=6x-7(9-x)4x-60+3x=6x-63+7x 4x+3x-6x-7x=-63+60 -6x=-3 x=1/2
(1) 1/3 - x-1/2 = 1
-x=-1/3+1/2+1
= -2/6 + 3/6 + 6/6
= 7/6
x=-7/6
(2) x+8/3=-x
x+x=-8/3
2x=-8/3
x=-4/3
(3) 1-m/2 - 3-3m/4=1
-m/2-3m/4 = -1+3+1
-3m/2 = 3
-3m=6
m=-2
(4) x-2/0.2 - x+1/0.5=3
5(x-2) - 2(x+1) = 3
5x-10 - 2x-2 = 3
3x = 10+2+3
x= 5
祝学习进步,望采纳!