随堂练习_合并同类项:(1)3f+2f-7f(3)2y+6y+2xy-5(4)3b-3a3+1+a3-2b=-2f=15pq=2xy+8y-5=-2a3+b+1(2)3pq+7pq+4pq+pq=?指出错误的地方.(1)3x+3y=6xy;不正确不能合并同类项.(2)7x-5x=2x2;不正确7x-5x=(3)-y2-y2=0;不正确-y2-y2=-2y2.(4)-19a2b-9ab2=:将p=3,q=3带入上式,可得:原式=-=6,n=2带入上式,可得:原式=.嚏差胰蝶杯撮行刻虽卞慑副销省咳海垢咱碘蚁默搞辙礁凹谭销羹捧宾铜欺随堂练****_合并同类项随堂练****_合并同类项
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