已知A=x³-2x²+1,B=2x²-3x-1.求A-B
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已知A=x³-2x²+1,B=2x²-3x-1.求A-B
已知A=x³-2x²+1,B=2x²-3x-1.求A-B
已知A=x³-2x²+1,B=2x²-3x-1.求A-B
A-B=(x³-2x²+1)-(2x²-3x-1)=x³-2x²+1-2x²+3x+1=x³-4x²+3x+2
x³-2x²+1-2x²+3x+1.
=x³+3x+2
A-B= x³-2x²+1 - (2x²-3x-1)
=x³-2x²+1-2x²+3x+1.
=x³-4x²+3x+2
解A-B=x³-2x²+1-(2x²-3x-1)
=x³-2x²+1-2x²+3x+1
=x³-4x²+3x+2
=(x³-2x²+1)-(2x²-3x-1)=x³-2x²+1-2x²+3x+1=x³+3x+2