题目内容
怎样简便就怎样算.
(1)(
-
)×24
(2)
÷8+
×
(3)[
×(
-
)]÷
(4)1÷
-
÷1.
(1)(
| 3 |
| 4 |
| 1 |
| 6 |
(2)
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 8 |
(3)[
| 3 |
| 4 |
| 1 |
| 3 |
| 2 |
| 9 |
| 1 |
| 3 |
(4)1÷
| 3 |
| 4 |
| 3 |
| 4 |
分析:(1)(2)运用乘法分配律解答,
(3)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序解答,
(4)按照先同时计算除法,再算减法顺序解答.
(3)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序解答,
(4)按照先同时计算除法,再算减法顺序解答.
解答:解:(1)(
-
)×24
=
×24-
×24
=18-6
=12;
(2)
÷8+
×
=(
+
)×
=
;
(3)[
×(
-
)]÷
=[
×
]÷
=
÷
=
;
(4)1÷
-
÷1,
=
-
=
.
| 3 |
| 4 |
| 1 |
| 6 |
=
| 3 |
| 4 |
| 1 |
| 6 |
=18-6
=12;
(2)
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 8 |
=(
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 8 |
=
| 1 |
| 8 |
(3)[
| 3 |
| 4 |
| 1 |
| 3 |
| 2 |
| 9 |
| 1 |
| 3 |
=[
| 3 |
| 4 |
| 1 |
| 9 |
| 1 |
| 3 |
=
| 1 |
| 12 |
| 1 |
| 3 |
=
| 1 |
| 4 |
(4)1÷
| 3 |
| 4 |
| 3 |
| 4 |
=
| 4 |
| 3 |
| 3 |
| 4 |
=
| 7 |
| 12 |
点评:(1)正确运用乘法分配律解决问题,(2)依据四则运算顺序正确进行计算,是本题考查知识点.
练习册系列答案
相关题目