0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=6（x+1.2)=18.6 x= 7x+2x = 8.1 x= (x-5）÷3=1.7 x=5（x+1.1)=15.5 x= 9x+25=70 x= 7x-4x=2.1 x=

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0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=6（x+1.2)=18.6 x= 7x+2x = 8.1 x= (x-5）÷3=1.7 x=5（x+1.1)=15.5 x= 9x+25=70 x= 7x-4x=2.1 x=
0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=
6（x+1.2)=18.6 x= 7x+2x = 8.1 x= (x-5）÷3=1.7 x=
5（x+1.1)=15.5 x= 9x+25=70 x= 7x-4x=2.1 x=

0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=6（x+1.2)=18.6 x= 7x+2x = 8.1 x= (x-5）÷3=1.7 x=5（x+1.1)=15.5 x= 9x+25=70 x= 7x-4x=2.1 x=
0.3+0.3x=0.39 x=0.3
2x-1.5x=7.6x x=0
0.36x÷0.3=1.2 x=1
6（x+1.2)=18.6 x= 1.9
7x+2x = 8.1 x=0.9
(x-5）÷3=1.7 x=10.1
5（x+1.1)=15.5 x=2
9x+25=70 x=5
7x-4x=2.1 x=0.7

0.3+0.3x=0.39 0.3x=0.09 x=0.3
2x-1.5x=7.6x 7.1x=0 x=0
0.36x÷0.3=1.2 0.36x=0.36 x=1
6（x+1.2)=18.6 x+1.2=3.1 x=1.9
7x+2x = 8.1 9x=8.1 x=0.9
(...

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0.3+0.3x=0.39 0.3x=0.09 x=0.3
2x-1.5x=7.6x 7.1x=0 x=0
0.36x÷0.3=1.2 0.36x=0.36 x=1
6（x+1.2)=18.6 x+1.2=3.1 x=1.9
7x+2x = 8.1 9x=8.1 x=0.9
(x-5)÷3=1.7 x-5=5.1 x=10.1
5（x+1.1)=15.5 x+1.1=3.1 x=2
9x+25=70 9x=45 x=5
7x-4x=2.1 3x=2.1 x=0.7
应该是这你再验算一下

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0.3+0.3x=0.39 x= 2x-1.5x=7.6x x= 0.36x÷0.3=1.2 x=6（x+1.2)=18.6 x= 7x+2x = 8.1 x= (x-5）÷3=1.7 x=5（x+1.1)=15.5 x= 9x+25=70 x= 7x-4x=2.1 x= 0.5X+120+0.3X=X x-0.3x-0.5x=20 X+0.3X=1000 求X? 解方程.[X-0.3X-0.2(X-0.3X)-2]-0.3X=28 81x-342=76(x-2) 0.3x+7x-0.25x=21.15 f(x)=x^2+x (x x-0.3x=14 (X-180)/X=0.3 x-0.3x=8 x+0.5x=0.3 x-0.3x=1.4 求x：(2x+3):0.3=(x+2):0.06 (x+1)/0.3-2x=(0.1x+0.2)/0.05 解方程 8x-5x=2x+0.3 0.3(x+1)+0.25(100-x)=2/5x 0.3x+1.2-2x=1.2-27x （X+X)+(X-X)+(X*X)+(X/X)=100