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Question

Simplify (25÷28)5 × 25.


A

1210

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B

1220

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C

12(15)

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D

12(5)

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Solution

The correct option is B

1220


(25÷28)5×25=(2528)5×25
=(258)5×25 (aman=amn)
=(23)5×25
=215×25 ((am)n=amn)
=2155 (am×an=am+n)
=220
=1220 (am=1am)


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