问题
解答题
已知A=x3-4x2+2x,B=2x2+1,C=x3+2x,求A-(B+C).
答案
A-(B+C)=x3-4x2+2x-(2x2+1+x3+2x)
=x3-4x2+2x-2x2-1-x3-2x
=-6x2-1.
已知A=x3-4x2+2x,B=2x2+1,C=x3+2x,求A-(B+C).
A-(B+C)=x3-4x2+2x-(2x2+1+x3+2x)
=x3-4x2+2x-2x2-1-x3-2x
=-6x2-1.