如题所述
1. 2/3x-20=3/5x+25
10x-300=9x+375
10x-9x=375+300
x=675
2. 0.36×5-1/4x=35-1/2x
1.8-0.25x=35-0.5x
0.5x-0.25x=35-1.8
0.25x=33.2
x=132.8
3. (6+x)÷2=18-x
6+x=2(18-x)
6+x=36-2x
x+2x=36-6
3x=30
x=10
4. (x+2)/(x-2)=4:(10×30%)
4(x-2)=3(x+2)
4x-8=3x+6
4x-3x=6+8
x=14
5. 4/15:(4x)=1/12:3
1/12×4x=4/15×3
1/3x=4/5
x=4/5×3
x=12/5
6. 30%x/5=(x+2):(5÷1/6)
0.3x/5=(x+2):30
5(x+2)=0.3x×30
5x+10=9x
9x-5x=10
4x=10
x=2.5追问
10x-300=9x+375
10x-9x=375+300
x=675
2. 0.36×5-1/4x=35-1/2x
1.8-0.25x=35-0.5x
0.5x-0.25x=35-1.8
0.25x=33.2
x=132.8
3. (6+x)÷2=18-x
6+x=2(18-x)
6+x=36-2x
x+2x=36-6
3x=30
x=10
4. (x+2)/(x-2)=4:(10×30%)
4(x-2)=3(x+2)
4x-8=3x+6
4x-3x=6+8
x=14
5. 4/15:(4x)=1/12:3
1/12×4x=4/15×3
1/3x=4/5
x=4/5×3
x=12/5
6. 30%x/5=(x+2):(5÷1/6)
0.3x/5=(x+2):30
5(x+2)=0.3x×30
5x+10=9x
9x-5x=10
4x=10
x=2.5追问
太感谢啦
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