合并同类项综合练习题90
6c-6c-5c 3n+9c-6n-9c
2b-5n+13b-14n+12b+19n 3ab-12ab-17ab+ab 23a2b-6b2c-7a2b+6b2c 4t+5t2-4t+9t2-1
3 1 7 5
—z+—t+—t-—z 18x2+5mn+9x2-2
2 8 2 8
1
—ab-5y-8ab 7pq+17x2y+9pq+21pq
7
8f-4f-7f 6t+5a-6t-7a
7m+8n-11m-12n+13m-15n 5mn-18mn-19mn-mn 9x2y+6b2c+24x2y+2b2c 9x-5x2+6x-12x2+3
1 1 7 5
—x+—n+—n-—x 7y2+2xy-7y2+2
5 6 5 6
1
—pq+5y+9pq 6xy+14x2y-2xy-3xy
2
9e-3e-8e 8z-2f-3z+3f
6m+2d+11m-9d+10m-12d 2pq+8pq-18pq-pq 23a2b-4b2c-6a2b+3b2c 3z-6z2-7z-9z2-3
1 1 7 5
—z+—y+—y+—z 3z2+3ab+6z2+5
2 7 2 7
1
—xy-3y+6xy 8mn-13a2b+5mn-12mn
2
8f-8f+4f 2n+6e+5n+5e
5a-7d+18a-18d-18a+12d 4xy-10xy-16xy-xy 15a2b-2y2z+28a2b-6y2z 9m+2m2-6m+10m2-5
3 1 7 5
—x+—y+—y+—x 20y2-7mn-2y2+8
4 7 4 7
1
—xy+5m-2xy 3xy-12a2b-9xy+16xy
5
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