几道数学填空题,急!在线等!
(-x+4y+z)(-x+4y-z)=_______
(3a-1)(_______)=1-6a+9a²
(-x-y)·(x-y)=______
4x²+9y²=(2x+3y)²- _______=(2x-3y)²+________.
(x+1)²(x-1)²(x²+1)²=________
(x+y)²·(x²-2xy+y²)=_________
人气:484 ℃ 时间:2020-02-05 18:17:02
解答
(-x+4y+z)(-x+4y-z)=___x²-8xy+16y²-z²____ (3a-1)(__3a-1_____)=1-6a+9a² (-x-y)·(x-y)=-x²-2xy-y²______ 4x²+9y²=(2x+3y)² - __12xy_____=(...
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