合并同类项:2a+3b+6a+9b-8b+12b= 3pq+7pq+4pq+pq= 7xy-8wy+5=

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合并同类项:2a+3b+6a+9b-8b+12b=3pq+7pq+4pq+pq=7xy-8wy+5=合并同类项:2a+3b+6a+9b-8b+12b=3pq+7pq+4pq+pq=7xy-8wy+5=

合并同类项:2a+3b+6a+9b-8b+12b= 3pq+7pq+4pq+pq= 7xy-8wy+5=
合并同类项:2a+3b+6a+9b-8b+12b= 3pq+7pq+4pq+pq= 7xy-8wy+5=

合并同类项:2a+3b+6a+9b-8b+12b= 3pq+7pq+4pq+pq= 7xy-8wy+5=
2a+3b+6a+9b-8b+12b
=2a+6a+3b+9b-8b+12b
=(2+6)a+(3+9-8+12)b
=8a+16b
3pq+7pq+4pq+pq
=(3+7+4+1)pq
=15pq
7xy-8wy+5?
是7xy-8xy+5吧
=(7-8)xy+5
=-xy+5
=5-xy

(2+6)a+(3+9+12-8)b=8a+16b