计算:(y3)5÷(y4)2·y3= ________________.
已知3a2b·A=12a5b4+9a4b3-6a3b3-3a2b2 ,则A= ________________.
多项式 A与2x的积为2x2+14x ,则A= ________________.
计算:(3ab)2÷ab= ________________.
计算:(a2b)2÷a= ________________.
计算:x6(-y)2÷x3= _______________.