问题
解答题
已知A=x3-2x2+1,B=-3x3-4x2+2.
求:3A-B.
答案
3A-B=3(x3-2x2+1)-(-3x3-4x2+2)
=3x3-6x2+3+3x3+4x2-2
=6x3-2x2+1.
已知A=x3-2x2+1,B=-3x3-4x2+2.
求:3A-B.
3A-B=3(x3-2x2+1)-(-3x3-4x2+2)
=3x3-6x2+3+3x3+4x2-2
=6x3-2x2+1.