X+Y=Z X+Y+Z=80已知Y等于10求X和Z
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X+Y=Z X+Y+Z=80已知Y等于10求X和Z
X+Y=Z X+Y+Z=80已知Y等于10求X和Z
X+Y=Z X+Y+Z=80已知Y等于10求X和Z
Y=10
X+10=Z
代入
X+10+Z=80
X+10+X+10=80
2X=60
X=30
Z=X+10=40
Z=40,X=30
X+10=Z X=Z-10
X+10+Z=80 Z-10+10+Z=80 Z=40
X=40-10=30
X+10=Z
X+10+Z=80
得X-Z=-10
X+Z=70
两式相加:2X=60
X=30
Z=40
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