解二元一次方程组 5
①{x/2+y/3=20.2x+0.3y=2.8②{(y+1)/4=(x+2)/32x-3y=1③{x/2-y/5=4x/7-y/15=3④{3(x+y)-4(x-y)=...
①{x/2+y/3=2 0.2x+0.3y=2.8
②{(y+1)/4=(x+2)/3 2x-3y=1
③{x/2-y/5=4 x/7-y/15=3
④{3(x+y)-4(x-y)=4 (x+y)/2+(x-y)/6=1 展开
②{(y+1)/4=(x+2)/3 2x-3y=1
③{x/2-y/5=4 x/7-y/15=3
④{3(x+y)-4(x-y)=4 (x+y)/2+(x-y)/6=1 展开
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