1.x+5x-f-4f
6x-5f
2.2a+6a-8a+3b+9b+12b
24b
3.15pq(一步就行了)
4.30ab-15ab+2bc-4bc
15ab-2bc
5.7xy+5xy-12xy-8wx
-8wx
6.3b-2b-3a+a+1
b-2a+1
1.x+5x-f-4f
6x-5f
2.2a+6a-8a+3b+9b+12b
24b
3.15pq(一步就行了)
4.30ab-15ab+2bc-4bc
15ab-2bc
5.7xy+5xy-12xy-8wx
-8wx
6.3b-2b-3a+a+1
b-2a+1