求一道数学的因式分解因式分解,该怎么写啊?
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求一道数学的因式分解因式分解,该怎么写啊?
求一道数学的因式分解
因式分解,该怎么写啊?
求一道数学的因式分解因式分解,该怎么写啊?
原式=x^2-y^2-2x-4y-3
=x^2-2x+1-y^2-4y-4
=(x-1)^2-(y+2)^2
=(x-1+y+2)(x-1-y-2)
=(x+y+1)(x-y-3)
x^2-y^2-2x-4y-3
=x^2-2x+1-(y^2+4y+4)
=(x-1)^2-(y+2)^2
=(x-1-y-2)(x-1+y+2)
=(x-y-3)(x+y+1)
(x-1)的平方-(y+2)的平方=(x+y+1)(x-y-3)
x^2-y^2-2x-4y-3
=x^2-2x+1-(y^2+4y+4)
=(x-1)^2-(y+2)^2
=(x-1+y+2)*(x-1-y-2)
=(x+y+1)*(x-y-3)
就是把-3变成(1-4),得(x-1)的平方-(y+2)的平方
x^2-y^2-2x-4y-3
=x^2-2x+1-(y^2+4y+4)
=(x-1)^2-(y+2)^2
=(x-1+y+2)(x-1-y-2)
=(x+y+1)(x-y-3)
(x-1)∧2-(y-2)∧2
∧2表示平方
(x-1)^2-(y+1)^2
二次方看的懂吧,这是和的平方拆分最简单的,把后面的3拆开就是了