问题 选择题

求7m比4m多百分之几,正确列式是(  )

A.(7-4)÷7

B.(7-4)÷4

C.1-4÷7

D.7÷4-1

答案

(7m-4m)÷4m

=(7-4)÷4(与选项B相同)

=3÷4

=75%

答:7m比4m多75%.

故选:B.

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