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由題意知 2a-b=4(1) 2b+a=5(2) (1)*2得:4a-2b=8(3) (3)+(2)得:5a=13,a=13/5 將a=13/5帶入(1)得;2*13/5-b=4,-b=4-26/5,-b=-6/5,b=6/5 所以a+b=13/5+6/5=19/5
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