-4/9x²+4/3xy+y²
-4/9x²+4/3xy+y²
其他人氣：596 ℃時(shí)間：2020-10-01 07:36:54
優(yōu)質(zhì)解答
-4/9x²+4/3xy+y²=-4/9（x²-3xy)+y²=-4/9（x-3y/2)²+2y²=2y²-4/9（x-3y/2)²=2y²-（2x/3-y)²=(√2y-2x/3+y)(√2y+2x/3-y)祝你開(kāi)心
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