合并同类项综合练习题93
7m+6n+11m-5n-11m+15n 2pq+15pq+20pq-pq 30a2b-4b2c-18a2b+6b2c 2m+8m2+9m+17m2-5
3 7 7 5
—x+—y-—y+—x 6t2-2pq+8t2-4
4 6 4 6
1
—pq+6n+8pq 7xy+2a2b-10xy-22xy
5
2m+9n+9m+11n-10m+14n 3xy+13xy+12xy+xy 21a2b-4b2c-21a2b-4b2c 5m+6m2-6m-14m2+5
1 9 7 5
—z-—n-—n-—z 3y2-7ab+4y2-8
5 8 5 8
6
—mn-9n+9mn 9xy-5x2y+20xy+6xy
7
3f+6f+8f 4t-9f+9t-7f
6a+3d-17a+18d+12a+16d 4xy-2xy+10xy+xy 20a2b-6y2z-17a2b-2y2z 5n-9n2+3n-6n2-7
5 5 7 5
—z-—y+—y-—z 19t2-8xy-7t2+5
4 6 4 6
3
—xy+3m-3xy 3mn-6x2y-9mn-17mn
4
9c-6c+5c 9n+5d-2n+10d
3b-4c-6b+17c+14b-20c 3pq-8pq-15pq-pq 29x2y+4y2z-13x2y+9y2z 6m-3m2+6m+4m2+3
1 9 7 5
—z-—n+—n+—z 2x2+9mn+4x2+7
4 8 4 8
1
—ab+9m+8ab 5pq+9x2y-5pq+21pq
2
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