问题
填空题
ab（______）=a3b+2a2b+3ab．
答案
∵（a3b+2a2b+3ab）÷ab=a2+2a+3，
∴ab（a2+2a+3）=a3b+2a2b+3ab．
故应填：a2+2a+3．
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ab（______）=a3b+2a2b+3ab．
∵（a3b+2a2b+3ab）÷ab=a2+2a+3，
∴ab（a2+2a+3）=a3b+2a2b+3ab．
故应填：a2+2a+3．