(1).(x+2y-3z)(x-2y+3z) (2).(x+2y-1)^2 运用乘法公式计算
(1).(x+2y-3z)(x-2y+3z) (2).(x+2y-1)^2 运用乘法公式计算
数学人气：986 ℃时间：2020-02-05 04:52:30
优质解答
(1).(x+2y-3z)(x-2y+3z) = [x+(2y-3z)] [x-(2y-3z)] =x²-(2y-3z)²=x²-(4y²-12yz+9z²)=x²-4y²+12yz-9z²(2).(x+2y-1)²=[(x+2y)－1]²=(x+2y)²-2(x+2y)+1=x...
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