x-y=3,3x+2y=19
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x-y=3,3x+2y=19
x-y=3,3x+2y=19
x-y=3,3x+2y=19
x-y=3
y=x-3
代入3x+2y=19
3x+2(x-3)=19
3x+2x-6=19
5x=25
x=5
y=x-3=2
x=5
y=2
y+3=x
y+y+y+y+y+3+3+3=19
5y=10
y=2
x=5
x=3+y
3(3+y)+2y=19
5y=10
y=2
x=3+y=5
x-y=3,
3x+2y=19
x=y+3代入第二式,
3(y+3)+2y=19
9+5y=19
y=2
x=y+3=5
可以组成方程组:
1: X-Y=3
3X+2Y=19
2:3X-3Y=9
3X+2Y=19
用第二步中的俩个式子相减
-5Y=-10 Y=2
将Y带入任何一个式子,X=5
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