三道计算题(1)化简:6x²y+2xy-8x²y-4x-5xy+2y²x²-6x
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三道计算题
(1)化简:
6x²y+2xy-8x²y-4x-5xy+2y²x²-6x²y
(2)先化简再求值:
(1/4)xy²+(2x²y-1)-(1/2)xy²-(3/2)x²y
其中x=-1,y=2
(3)先化简再求值:
4x²-{-3x²-[5x-x²-(2x²-x)]+4x}
其中x=-0.5
(1)化简:
6x²y+2xy-8x²y-4x-5xy+2y²x²-6x²y
(2)先化简再求值:
(1/4)xy²+(2x²y-1)-(1/2)xy²-(3/2)x²y
其中x=-1,y=2
(3)先化简再求值:
4x²-{-3x²-[5x-x²-(2x²-x)]+4x}
其中x=-0.5
1)-8x²y-3xy-4x+2y²x²
2)-(1/4)xy²+(1/2)x²y-1=1
3)4x²-{-3x²-6x-3x²}+4x
=10x²+6x+4x
=10(x²+x)
=10(0.25-0.5)
=-2.5
2)-(1/4)xy²+(1/2)x²y-1=1
3)4x²-{-3x²-6x-3x²}+4x
=10x²+6x+4x
=10(x²+x)
=10(0.25-0.5)
=-2.5
1-x²+2xy-y²
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
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