2A+B=8,A-B=7/10,求A和B
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2A+B=8,A-B=7/10,求A和B
2A+B=8,A-B=7/10,求A和B
2A+B=8,A-B=7/10,求A和B
2A+B=8 (1)
A-B=7/10 (2)
(1)+(2)
得3A=87/10
A=29/10
将A=29/10代入(2)
得29/10-B=7/10
B=22/10=11/5
所以A=29/10 B=11/5
两式相加得3A=87/10 A=29/10 B=11/5
A=29/10 B=11/5