几题解方程悬奖1002(x-2)+2=x+1y=1+y/3+14x-3(20-x)=5x-7(20-x)10(x+1)-5(0.2x+1)=1x/3-9x+1/6=13x/0.5+9/2-2.8-5x/0.2=0列出算式

Question

几题解方程 悬奖100
2(x-2)+2=x+1
y=1+y/3+1
4x-3(20-x)=5x-7(20-x)
10(x+1)-5(0.2x+1)=1
x/3-9x+1/6=1
3x/0.5+9/2-2.8-5x/0.2=0
列出算式

Answer 1

(1)
2（x-2）+2=x+1
2x-4=x-1
2x-x=-1+4
x=3
(2)
y=1+y/3+1
3y=3+y+3
3y-y=6
2y=6
y=3
(3)
4x-3(20-x)=5x-7(20-x)
4x-(60-3x)=5x-(140-7x)
4x-60+3x=5x-140+7x
4x+3x-5x-7x=-140+60
-5x=-80
x=16
(4)
10(x+1)-5(0.2x+1)=1
10x+10-(x+5)=1
10x+10-x-5=1
9x=1+5-10
9x=-4
x=-4/9
(5)
x/3-9x+1/6=1
2x-54x+1=6
-52x=6-1
-52x=5
x=-5/52
(6)
3x/0.5+9/2-2.8-5x/0.2=0
12x+9-5.6-50x=0
-38x=5.6-9
-38x=-3.4
x=17/190
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