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=8B=8-2A代入A-B=7/10A-8+2A=7/103A=8

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
B=8-2A
代入A-B=7/10
A-8+2A=7/10
3A=87/10
A=29/10
B=8-2A=11/5