Question

先化简,再求值,（不要添括号）⑴3y的4次方-6x的3次方y-4y的4次方+2yx的3次方.其中x=负2,y=负3 ⑵a

Answer 1

1、3y^4-6x³y-4y^4+2yx³

=-y^4-4x³y

=-(-3)^4-4x(-2)³x(-3)

=-81-96

=177

2、a^2+2a-2a^2-a+a^2-1

=a-1

=-5-1

=-6

3、3m-4m^2-3m+2m^2+1

=-2m^2+1

=-2*4+1

=-7

4、4ab-3a^2-ab+a^2-3ab-2b+2a^2

=-2b

=2