求大神指点这道题
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A=x³+3x²y-5xy²+6y³-1;
B=-6y³+5xy²+x²y-2x³+2=-2x³+x²y+5xy²-6y³+2;
C=x³-4x²y+3;
A+B+C=(x³+3x²y-5xy²+6y³-1)+(-2x³+x²y+5xy²-6y³+2)+(x³-4x²y+3)
=-1+2+3=4;
B=-6y³+5xy²+x²y-2x³+2=-2x³+x²y+5xy²-6y³+2;
C=x³-4x²y+3;
A+B+C=(x³+3x²y-5xy²+6y³-1)+(-2x³+x²y+5xy²-6y³+2)+(x³-4x²y+3)
=-1+2+3=4;
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