合并同类项综合练习题119
7a-7a+9a 2n-6a-6n+7a
6b+2n+15b-9n-15b-10n 9pq+7pq-12pq-pq 29x2y-5y2z+12x2y-6y2z 3n+5n2+8n-7n2+6
2 7 7 5
—x+—t-—t+—x 19y2-4ab-7y2-1
3 6 3 6
6
—mn-4y-3mn 8pq+14a2b+13pq+22pq
7
4c+2c+2c 6m-2c-2m-9c
8b-9d-5b+11d-10b+19d 9mn+15mn+14mn-mn 6a2b-5y2z+4a2b+9y2z 6z-7z2+2z+20z2+6
3 7 7 5
—z-—t+—t+—z 11t2-9pq+2t2-1
2 8 2 8
1
—pq+8t+4pq 9ab+12x2y+3ab-28ab
5
9e+2e-7e 5x+2e+4x+9e
5b+4n-2b+3n+18b+12n 3ab-8ab+12ab+ab 20x2y+8b2c+30x2y-3b2c 2t+3t2-6t-11t2+4
5 6 7 5
—m-—y-—y-—m 17t2+7mn-7t2+9
4 7 4 7
6
—mn+4n-9mn 2ab+2x2y+14ab+20ab
5
4f+4f+9f 5m-5b-3m+9b
8m-3c+8m+13c+14m+17c 2pq-20pq-19pq-pq 4a2b+9y2z-9a2b-8y2z 7n-3n2-6n+4n2+1
2 1 7 5
—x-—n-—n-—x 2x2+8ab-2x2-4
3 8 3 8
1
—ab+7t+7ab 7pq-19x2y+5pq+17pq
4
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