先化简再求值(3m+1)(2m-3)-(6m-5)(m-4),其中m=负1/2

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先化简再求值(3m+1)(2m-3)-(6m-5)(m-4),其中m=负1/2先化简再求值(3m+1)(2m-3)-(6m-5)(m-4),其中m=负1/2先化简再求值(3m+1)(2m-3)-(6m

先化简再求值(3m+1)(2m-3)-(6m-5)(m-4),其中m=负1/2
先化简再求值(3m+1)(2m-3)-(6m-5)(m-4),其中m=负1/2

先化简再求值(3m+1)(2m-3)-(6m-5)(m-4),其中m=负1/2
原式=6m²-7m-3-6m²+29m-20
=22m-23
当m=﹣1/2时,
原式=22×﹙﹣1/2﹚-23=﹣34.