数学题：合并同类项,快快!1.x-f+5x-4f2.2a+3b+6a+9b-8a+12b3.3pq+7pq+4pq+pq4.30a_数学解答

数学题：合并同类项,快快!
1.x-f+5x-4f
2.2a+3b+6a+9b-8a+12b
3.3pq+7pq+4pq+pq
4.30ab+2bc-15ab-4bc
5.7xy-8wx+5xy-12xy
快快,要详细过程!
还有：3b-3a+1+a-2b

人气：446 ℃　时间：2019-12-17 17:09:34

解答

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