题目内容
乙数是48,甲数的
与乙数的
相等,乙数是
- A.72
- B.32
- C.12
A
分析:先把乙数看成单位“1”,用乙数乘上
,求出乙数的
是多少,再把甲数看成单位“1”,它的
对应的数量是乙数的
,由此用除法求出甲数.
解答:48×
÷
,
=12÷
,
=72;
答:乙数是72.
故选:A.
点评:解答此题的关键是分清两个单位“1”的区别,求单位“1”的几分之几用乘法;已知单位“1”的几分之几是多少,求单位“1”用除法.
分析:先把乙数看成单位“1”,用乙数乘上
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解答:48×


=12÷

=72;
答:乙数是72.
故选:A.
点评:解答此题的关键是分清两个单位“1”的区别,求单位“1”的几分之几用乘法;已知单位“1”的几分之几是多少,求单位“1”用除法.

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