8m²+2m-1>0 (4m-1)(2m+1)>0这一步对么?
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8m²+2m-1>0 (4m-1)(2m+1)>0这一步对么?
8m²+2m-1>0 (4m-1)(2m+1)>0
这一步对么?
8m²+2m-1>0 (4m-1)(2m+1)>0这一步对么?
对的,根据十字交叉法可以得到(4m-1)(2m+1)>0
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