先化简再求值:3(m+1)²-5(m+1)(m-1)+3m(m-1),其中m=5 (要过程)
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![先化简再求值:3(m+1)²-5(m+1)(m-1)+3m(m-1),其中m=5 (要过程)](/uploads/image/z/1012631-23-1.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A3%EF%BC%88m%2B1%EF%BC%89%26%23178%3B-5%28m%2B1%29%EF%BC%88m-1%EF%BC%89%2B3m%EF%BC%88m-1%29%2C%E5%85%B6%E4%B8%ADm%3D5+%EF%BC%88%E8%A6%81%E8%BF%87%E7%A8%8B%EF%BC%89)
先化简再求值:3(m+1)²-5(m+1)(m-1)+3m(m-1),其中m=5 (要过程)
先化简再求值:3(m+1)²-5(m+1)(m-1)+3m(m-1),其中m=5 (要过程)
先化简再求值:3(m+1)²-5(m+1)(m-1)+3m(m-1),其中m=5 (要过程)
3(m+1)²-5(m+1)(m-1)+3m(m-1)
=3(m²+2m+1)-5(m²-1)+3m²-3m
=m²+3m+8
当m=5时,原式=5²+3×5+8=48