问题
解答题
已知A=3a2b+3ab2+b4,B=a2b+11ab2+a4,C=-8ab2+2a2b+c4,求A+B-C.
答案
A+B-C=(3a2b+3ab2+b4)+(a2b+11ab2+a4)-(-8ab2+2a2b+c4)
=3a2b+3ab2+b4+a2b+11ab2+a4+8ab2-2a2b-c4
=a4+2a2b+22ab2+b4-c4.
已知A=3a2b+3ab2+b4,B=a2b+11ab2+a4,C=-8ab2+2a2b+c4,求A+B-C.
A+B-C=(3a2b+3ab2+b4)+(a2b+11ab2+a4)-(-8ab2+2a2b+c4)
=3a2b+3ab2+b4+a2b+11ab2+a4+8ab2-2a2b-c4
=a4+2a2b+22ab2+b4-c4.