⑴-t-t-t⑵9ab-4ab+ab-7ab+5ab⑶-12x+6y-3+10x-2-y⑷5m-7n-8p+5n-9m-p

⑴-t-t-t⑵9ab-4ab+ab-7ab+5ab⑶-12x+6y-3+10x-2-y⑷5m-7n-8p+5n-9m-p
⑴-t-t-t
⑵9ab-4ab+ab-7ab+5ab
⑶-12x+6y-3+10x-2-y
⑷5m-7n-8p+5n-9m-p

⑴-t-t-t⑵9ab-4ab+ab-7ab+5ab⑶-12x+6y-3+10x-2-y⑷5m-7n-8p+5n-9m-p
⑴-t-t-t
=-3t
⑵9ab-4ab+ab-7ab+5ab
=4ab
⑶-12x+6y-3+10x-2-y
=-2x-5y-5
⑷5m-7n-8p+5n-9m-p
=-4m-2n-9p

1、-3t
2、4ab
3、-2x+5y-5
4、-4m-2n-9p

(1)-3t
(2)4ab
(3)-2x+5y-5
(4)-4m-2n-9p

⑴-t-t-t
=-3t
⑵9ab-4ab+ab-7ab+5ab
=4ab
⑶-12x+6y-3+10x-2-y
=-2x-5y-5
⑷5m-7n-8p+5n-9m-p
=-4m-2n-9p
这么简单!!

1.(-1-1-1)t=-3t
2.(9-4+1-7+5)ab=4ab
3.(-12+10)x+(6-1)y-3-2=-2x+5y+(-3-2)=-2x+5y-5
4.(5-9)m+(-7+5)n+(-8-1)p=-4n-2n-9p