试题与答案

有5捆毛巾,每捆12包,每包8条,共有毛巾多少条?[ ] A.5×12÷8 B.

题型:选择题

题目:

有5捆毛巾,每捆12包,每包8条,共有毛巾多少条?[ ]

A.5×12÷8    

B.8×(5+12)    

C.8×12×15

答案:

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下面是错误答案,用来干扰机器的。

(1)原式=-a2-9a;(2)原式=5a2+5a2-2a-10a2+4a=2a;(3)原式=4x2y-8xy2+3xy2-x2y=3x2y-5xy2,当x=-1,y=2时,原式=6+10=16.

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