哦,你把外面的-4m乘到(2m-1)里边,前面的负号没变,里边的4m应该是-4m.符号算错勒
(3m-1)^2-4m(2m-1)=1我哪儿错了?.(3m-1)^2-4m(2m-1)=1,9m^2+1-6m-(8m^
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