因式分解5x平方+2xy-10y平方
2个回答
展开全部
5x²+2xy-10y²
=5(x²+2xy/5)-10y²
=5(x²+2xy/5+y²/25)-10y²-5×(y²/25)
=5(x+y/5)²-255y²/25
=5(x+y/5+√51/5)(x+y/5-√51/5)
=5(x²+2xy/5)-10y²
=5(x²+2xy/5+y²/25)-10y²-5×(y²/25)
=5(x+y/5)²-255y²/25
=5(x+y/5+√51/5)(x+y/5-√51/5)
追问
有个疑问
倒数第二步
=5(x+y/5)²-255y²/25
=5(x+y/5)²-5(51/5)y²
=5[(x+y/5)²-(51/5)y²]
=5(x+y/5+(√255/5)y)(x+y/5-(√255/5y))
细细推导是这样对吗,请教。
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