5x-y=3,
0.2x+0.3y=-0.9
y=5x-3
0.2x+0.3(5x-3)=-0.9
0.2x+1.5x-0.9=-0.9
1.7x=0
x=0
y=5*0-3=-3
x=0
y=-3
5x-y=3,0.2x+0.3y=-0.9
3个回答
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