题目内容
先列式再计算
(1)已知两个因数的积是
,一个因数是15,求另一个因数多少?
(2)
加上
除以
的商,所得的和乘
,积是多少?
(3)从
的倒数里减去
的
,差是多少?
(1)已知两个因数的积是
| 5 |
| 8 |
(2)
| 2 |
| 3 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
(3)从
| 3 |
| 8 |
| 1 |
| 4 |
| 2 |
| 3 |
(1)
÷15,
=
×
,
=
;
答:另一个因数是
.
(2)(
+
÷
)×
,
=(
+
×
)×
,
=(
+
)×
,
=1×
,
=
;
答:积是
.
(3)
-
×
,
=
-
,
=
;
答:差是
.
| 5 |
| 8 |
=
| 5 |
| 8 |
| 1 |
| 15 |
=
| 1 |
| 40 |
答:另一个因数是
| 1 |
| 40 |
(2)(
| 2 |
| 3 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
=(
| 2 |
| 3 |
| 1 |
| 4 |
| 4 |
| 3 |
| 1 |
| 4 |
=(
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
=1×
| 1 |
| 4 |
=
| 1 |
| 4 |
答:积是
| 1 |
| 4 |
(3)
| 8 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
=
| 8 |
| 3 |
| 1 |
| 6 |
=
| 15 |
| 6 |
答:差是
| 15 |
| 6 |
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