根据补充的条件列式计算.小红有72枚邮票, _ .小明有多少枚邮票?(1)小明的邮票枚数比小红少1/8. _ (2)小明的邮票枚数比小红多1/8. _ (3)比小明多1/8. _ (4)比小明少1/8. _ .

问题描述:

根据补充的条件列式计算.
小红有72枚邮票, ___ .小明有多少枚邮票?
(1)小明的邮票枚数比小红少

1
8
. ___
(2)小明的邮票枚数比小红多
1
8
. ___
(3)比小明多
1
8
. ___
(4)比小明少
1
8
. ___ .

(1)72×(1-

1
8
),
=72×
7
8

=63(枚);
答:小明有63枚邮票.
(2)72×(1+
1
8
),
=72×
9
8

=81(枚);
答:小明有81枚邮票.
(3)72÷(1+
1
8
),
=72÷
9
8

=64(枚);
答:小明有64枚邮票.
(4)72÷(1-
1
8
),
=72÷
7
8

=
576
7
(枚);
答:小明有
576
7
枚邮票.