题目内容
(
|
24×
| ||||||||||
|
48×(
|
分析:(1)运用乘法分配律解答,
(2)按照先算乘法,再算减法顺序解答,
(3)运用乘法交换律解答,
(4)按照先算括号里面的,再算括号外面的顺序解答.
(2)按照先算乘法,再算减法顺序解答,
(3)运用乘法交换律解答,
(4)按照先算括号里面的,再算括号外面的顺序解答.
解答:解:(1)(
-
)×
=
×
-
×
=1-
=
;
(2)24×
-
=20-
=19
;
(3)
×
×
=
×
×
=
×
=
;
(4)48×(
×
)
=48×
=3.
| 3 |
| 4 |
| 1 |
| 3 |
| 4 |
| 3 |
=
| 3 |
| 4 |
| 4 |
| 3 |
| 1 |
| 3 |
| 4 |
| 3 |
=1-
| 4 |
| 9 |
=
| 5 |
| 9 |
(2)24×
| 5 |
| 6 |
| 5 |
| 6 |
=20-
| 5 |
| 6 |
=19
| 1 |
| 6 |
(3)
| 9 |
| 13 |
| 5 |
| 6 |
| 13 |
| 15 |
=
| 9 |
| 13 |
| 13 |
| 15 |
| 5 |
| 6 |
=
| 3 |
| 5 |
| 5 |
| 6 |
=
| 1 |
| 2 |
(4)48×(
| 1 |
| 6 |
| 3 |
| 8 |
=48×
| 3 |
| 48 |
=3.
点评:本题主要考查学生依据四则运算计算方法,以及运用简便方法解决问题的能力.
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