计算(15y3-9y2-3y)÷(-3y)的正确结果是( )A.-5y2+3y_爱下问搜题

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问题选择题

计算(15y³-9y²-3y)÷(-3y)的正确结果是( )

A.-5y²+3y
B.-5y²+3y+1
C.-5y²-3y-1
D.-5y²+3y-1

答案

答案：B

选择题

She'll never forget her stay there _____ she found her son who had gone missing two years before.

A. that
B. which
C. where
D. when

填空题

如果a²+b²+2c²+2ac﹣2bc=0，那么2^a+b^﹣1的值为　　．