3(m+1)²-5(m+1)(m-1)+2(m-1)²=3m²+6m+3-5(m²-1)+2m²-4m+2=3m²+6m+3-5m²+5+2m²-4m+2=3m²-5m²+2m²+6m-4m+3+5+2=2m+10=2*(-1)+10=-2+10=8
3（M+1)²-5（m+1)(m-1)+2(m-1)²=3m²+6m+1-5m²+1+2m²-4m+2=2m+3=2x-1+3=1
