作业帮2x+2y=6.4 ,99%x+67%y=3.2*70%二元一次方程,
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2x+2y=6.4 ,99%x+67%y=3.2*70%二元一次方程,
2x+2y=6.4 ,99%x+67%y=3.2*70%
二元一次方程,
2x+2y=6.4 ,99%x+67%y=3.2*70%二元一次方程,
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
第一个式子，得
x+y=3.2
99%x+99%y=3.2*99%
用上面这个结果减去第二个式子，得
(99%x+99%y)-(99%x+67%y)=32%y=3.2*99%-3.2*70%=3.2*29%
y=3.2*29%/32%=2.9
x=3.2-y=0.3
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