3(m+1)-5(m+1)(m-1)+2(m-1),化简.其中m=5
问题描述:
3(m+1)-5(m+1)(m-1)+2(m-1),化简.其中m=5
答
3(m+1)-5(m+1)(m-1)+2(m-1) =3(m+2m+1)-5(m-1)+2(m-2m+1) =3m+6m+3-5m-5+2m-4m+2 =2m=10
3(m+1)-5(m+1)(m-1)+2(m-1),化简.其中m=5
3(m+1)-5(m+1)(m-1)+2(m-1) =3(m+2m+1)-5(m-1)+2(m-2m+1) =3m+6m+3-5m-5+2m-4m+2 =2m=10