4(m-1)²-4(m+1)怎么得出4m²-12m?4(m-1)²-4(m+1)=0怎么得出4m²-12m?
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4(m-1)²-4(m+1)怎么得出4m²-12m?4(m-1)²-4(m+1)=0怎么得出4m²-12m?4(m-1)²-4(m+1)怎么得出4m&
4(m-1)²-4(m+1)怎么得出4m²-12m?4(m-1)²-4(m+1)=0怎么得出4m²-12m?
4(m-1)²-4(m+1)怎么得出4m²-12m?
4(m-1)²-4(m+1)=0怎么得出4m²-12m?
4(m-1)²-4(m+1)怎么得出4m²-12m?4(m-1)²-4(m+1)=0怎么得出4m²-12m?
4(m-1)²-4(m+1)
=4(m²-2m+1)-4(m+1)
=4m²-8m+4-4m-4
=4m²-12m
4(m-1)²-4(m+1)
=4(m²-2m+1)-4(m+1)
=4m²-8m+4-4m-4
=4m²-12m
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