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a的二次方-ab-12b的二次方=0 (a/b)²;-(a/b)-12=0 ∴(a/b-4)(a/b+3)=0 ∴a/b=4 a/b=-3 2a-b\2a+b =[2(a/b)-1]/[2(a/b)+1] 當a/b=4時原式=(8-1)/(8+1)=7/9 當a/b=-3時原式=(-6-1)/(-6+1)=7/5
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