1.合并同类项:⑴x-f+5x-4f; ⑵2a+3b+6a+9b-8a+12b; ⑶30a²b+1.合并同类项:⑴x-f+5x-4f;⑵2a+3b+6a+9b-8a+12b;⑶30a²b+2b²c-15a²b-4b²c;⑷7xy-8wx+5xy-12xy.

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1.合并同类项:⑴x-f+5x-4f; ⑵2a+3b+6a+9b-8a+12b; ⑶30a²b+1.合并同类项:⑴x-f+5x-4f;⑵2a+3b+6a+9b-8a+12b;⑶30a²b+2b²c-15a²b-4b²c;⑷7xy-8wx+5xy-12xy.
1.合并同类项:⑴x-f+5x-4f; ⑵2a+3b+6a+9b-8a+12b; ⑶30a²b+
1.合并同类项:
⑴x-f+5x-4f;
⑵2a+3b+6a+9b-8a+12b;
⑶30a²b+2b²c-15a²b-4b²c;
⑷7xy-8wx+5xy-12xy.

1.合并同类项:⑴x-f+5x-4f; ⑵2a+3b+6a+9b-8a+12b; ⑶30a²b+1.合并同类项:⑴x-f+5x-4f;⑵2a+3b+6a+9b-8a+12b;⑶30a²b+2b²c-15a²b-4b²c;⑷7xy-8wx+5xy-12xy.