先化简再求值: (1)3(m+1)눀-5(m+1)(m-1)+3m(m-1),其中m=5

要详细过程
2025-01-05 01:04:17
推荐回答(3个)
回答1:

3(m+1)²-5(m+1)(m-1)+3m(m-1)
=3(m²+2m+1)-5(m²-1)+(3m²-3m)
=3m²+6m+3-5m²+5+3m²-3m
=m²+3m+8
=5²+3×5+8
=25+15+8
=48

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回答2:

3(m+1)²-5(m+1)(m-1)+3m(m-1),其中m=5
=3m²+6m+3-5m²+5+3m²-3m
=m²+3m+8
=5²+3*5+8
=25+15+8
=48

回答3: