初一数学题,关于整数的加减.A=x³-2³χ²y+2xy²-2²y³,B=x³+3χ²y-5xy²-y³,C=-2χ³+2²χ²y-5xy²+3y³.(1)求A+(B-C) (2)A-(B-C)
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初一数学题,关于整数的加减.A=x³-2³χ²y+2xy²-2²y³,B=x³+3χ²y-5xy²-y³,C=-2χ³+2²χ²y-5xy²+3y³.(1)求A+(B-C) (2)A-(B-C)
初一数学题,关于整数的加减
.A=x³-2³χ²y+2xy²-2²y³,B=x³+3χ²y-5xy²-y³,C=-2χ³+2²χ²y-5xy²+3y³.
(1)求A+(B-C) (2)A-(B-C)
初一数学题,关于整数的加减.A=x³-2³χ²y+2xy²-2²y³,B=x³+3χ²y-5xy²-y³,C=-2χ³+2²χ²y-5xy²+3y³.(1)求A+(B-C) (2)A-(B-C)
(1)
x³-2³χ²y+2xy²-2²y³+x³+3χ²y-5xy²-y³-(-2χ³+2²χ²y-5xy²+3y³.)
=4x³-7χ²y+2xy²-8y³
(2)x³-2³χ²y+2xy²-2²y³-[x³+3χ²y-5xy²-y³-(-2χ³+2²χ²y-5xy²+3y³.)]
=x³-2³χ²y+2xy²-2²y³-[x³+3χ²y-5xy²-y³+2χ³-2²χ²y+5xy²-3y³.]
=-2χ³-χ²y+2xy²