(2x1的-5x2的平方-4x+1)-(3x3的平方-5x2的平方-3x)有要过程 -[-(-x+2分之一)]-(x-1)
-3(2分之一x2的平方-2xy+y)加2分之一(2x2的平方-xy-2y2的平方)
人气:208 ℃ 时间:2020-10-01 08:52:19
解答
(2x³-5x²-4x+1)-(3x³-5x²-3x)
=2x³-5x²-4x+1-3x³+5x²+3x
=-x³-x+1
-[-(-x+1/2)]-(x-1)
=(-X+1/2)-X+1
=-X+1/2-X+1
=-2X+3/2
-3(1/2x²-2xy+y)+1/2(2x²-xy-2y²)
=-3/2x²+6xy-3y+x²-1/2xy-y²
=-X²+11/2XY-4Y²
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