方程咋解:3(3X-2)=10-0.5(X+3.5) X+5Y=21 9x+2y=15 x-y=3 3x+4y=10 3x+12.5 =5x+7.7 4(x+5)=80-x1.2.5(x-2)-x+22.3(3X-2)=10-0.5(X+3.5)3.{ X+5Y=21{ x-y=3 4.{9x+2y=15{3x+4y=105.3x+4y=236.3x+12.5 =5x+7.77.4(x+5)=80-x

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方程咋解:3(3X-2)=10-0.5(X+3.5) X+5Y=21 9x+2y=15 x-y=3 3x+4y=10 3x+12.5 =5x+7.7 4(x+5)=80-x
1.2.5(x-2)-x+2
2.3(3X-2)=10-0.5(X+3.5)
3.{ X+5Y=21
{ x-y=3
4.{9x+2y=15
{3x+4y=10
5.3x+4y=23
6.3x+12.5 =5x+7.7
7.4(x+5)=80-x

3(3X-2)=10-0.5(X+3.5)X+5Y=21x=21-5Y 9x+2y=15 4.3x+12.5 =5x+7.7 5.4(x+5)=80-x