2x+2y=6.4 ,99%x+67%y=3.2*70%
2个回答
2x+2y=6.4
所以y=3.2-x
代入0.99x+0.67y=2.24
0.99x+2.144-0.67x=2.24
0.32x=0.096
所以
x=0.3
y=3.2-x=2.9
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