展非
幼苗
共回答了1个问题 举报
2ax-10ay+5by-bx
=(2ax-10ay)-(bx-5by)
=2a(x-5y)-b(x-5y)
=(2a-b)(x-5y)
ab(c^2-d^2)-(a^2-b^2)cd
=abc^2 - abd^2 -a^2 cd + b^2 cd
=(abc^2 + b^2 cd) - ( abd^2 +a^2 cd )
=bc(ac + bd) - ad(bd +ac)
=(ac + bd) (bc - ad)
x^2-y^2+ax+ay
=(x+y)(x-y) +a(x+y)
=(x+y)(x-y+a)
1年前
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