40x=35*(x=4) 7:5=(1/2x):(1/2-42) 3:5=x:(20-x) 1.5x=1.25*(x+10) 50x=70*15-70x 7x=5(x+1.8)50x=70*(1又1/5*x)
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![40x=35*(x=4) 7:5=(1/2x):(1/2-42) 3:5=x:(20-x) 1.5x=1.25*(x+10) 50x=70*15-70x 7x=5(x+1.8)50x=70*(1又1/5*x)](/uploads/image/z/997687-55-7.jpg?t=40x%3D35%2A%28x%3D4%29+7%3A5%3D%281%2F2x%29%3A%281%2F2-42%29+3%3A5%3Dx%3A%2820-x%29+1.5x%3D1.25%2A%28x%2B10%29+50x%3D70%2A15-70x+7x%3D5%28x%2B1.8%2950x%3D70%2A%281%E5%8F%881%2F5%2Ax%29)
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40x=35*(x=4) 7:5=(1/2x):(1/2-42) 3:5=x:(20-x) 1.5x=1.25*(x+10) 50x=70*15-70x 7x=5(x+1.8)50x=70*(1又1/5*x)
40x=35*(x=4) 7:5=(1/2x):(1/2-42) 3:5=x:(20-x) 1.5x=1.25*(x+10) 50x=70*15-70x 7x=5(x+1.8)
50x=70*(1又1/5*x)
40x=35*(x=4) 7:5=(1/2x):(1/2-42) 3:5=x:(20-x) 1.5x=1.25*(x+10) 50x=70*15-70x 7x=5(x+1.8)50x=70*(1又1/5*x)
40x=35*(x+4)
40x=35x+140
5x=140
x=28
7:5=(1/2x):(1/2-42)
5*(1/2x)=7*(1/2-42)
2*5*(1/2x)=2*7*(1/2-42)
5x=7-588
x=-581/5
3:5=x:(20-x)
3(20-x)=5x
60-3x=5x
8x=60
x=15/2
1.5x=1.25*(x+10)
1.5x=1.25x+12.5
0.25x=12.5
x=50
50x=70*15-70x
120x=1050
x=35/4
7x=5(x+1.8)
7x=5x+9
2x=9
x=9/2
50x=70*(1又1/5*x)
50x=84x
x=0