=y(y+3)-4(y+3)²=(y+3)(y-4y-12)怎么算的
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=y(y+3)-4(y+3)²=(y+3)(y-4y-12)怎么算的=y(y+3)-4(y+3)²=(y+3)(y-4y-12)怎么算的=y(y+3)-4(y+3)²=(
=y(y+3)-4(y+3)²=(y+3)(y-4y-12)怎么算的
=y(y+3)-4(y+3)²=(y+3)(y-4y-12)怎么算的
=y(y+3)-4(y+3)²=(y+3)(y-4y-12)怎么算的
提取公因式 （y+3）
y(y+3)-4(y+3)²
=(y+3)【y-4（y+3）】
=(y+3)(y-4y-12）
=y(y+3)-4(y+3)² 提取公因式(y+3)
=(y+3)(y-4y-12)
提取公因式y+3
则原式=(y+3)[y-4(y+3)]
=(y+3)(y-4y-12)