合并下列各式的同类项!
(1)4x²-y-8xy²+2x²y-3xy²(2)3x²-1-2x-5+3x-x²(3)-0.8x²...
(1)4x²-y-8xy²+2x²y-3xy²
(2)3x²-1-2x-5+3x-x²
(3)-0.8x²y-6xy-1.2x²y+5xy+x²y 展开
(2)3x²-1-2x-5+3x-x²
(3)-0.8x²y-6xy-1.2x²y+5xy+x²y 展开
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