Question

1.196(a-b)*-196(a+b)*

Answer 1

1.196(a-b)*-196(a+b)*

=196[(a-b)*-(a+b)*]

=196(a*-2ab+b*-a*-2ab-b*)

=196(-4ab)

=-784ab

2.(a+b+c)*-(a+b-c)*

=(a+b)*+2(a+b)c+c*-(a+b)*+2(a+b)c-c*

=4(a+b)c

=4ac+4bc

3.(2p+3q)*-(3p-q)/

=4p*+6pq+9q*-(27p^3-27p*q+9pq*-q^3)

=

抱歉,没时间做了剩下的应该会了吧

4.(x*+y*)*-x*y*

=x^4+2x*y*+y^4-x*y*

=x^4+x*y*+y^4