题目内容
能简便的要用简便算法计算
|
| ||||||||||||
|
13-13×
|
分析:(1)(4)运用乘法分配律解答,
(2)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计算即可解答,
(3)按照从左到右顺序计算即可解答.
(2)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计算即可解答,
(3)按照从左到右顺序计算即可解答.
解答:解:(1)
÷9-
×
=(
-
)×
=2×
=
;
(2)
÷[18×(
-
)]
=
÷[18×
]
=
÷
=1;
(3)
×
÷
÷
=
÷
÷
=
÷
=
;
(4)13-13×
=13×(1-
)
=13×
=
.
12 |
5 |
2 |
5 |
1 |
9 |
=(
12 |
5 |
2 |
5 |
1 |
9 |
=2×
1 |
9 |
=
2 |
9 |
(2)
3 |
2 |
5 |
6 |
3 |
4 |
=
3 |
2 |
1 |
12 |
=
3 |
2 |
3 |
2 |
=1;
(3)
2 |
3 |
3 |
5 |
3 |
5 |
3 |
2 |
=
2 |
5 |
3 |
5 |
3 |
2 |
=
2 |
3 |
3 |
2 |
=
4 |
9 |
(4)13-13×
96 |
97 |
=13×(1-
96 |
97 |
=13×
1 |
97 |
=
13 |
97 |
点评:本题考查知识点:(1)正确运用乘法分配律解决问题,(2)依据四则运算计算方法正确进行计算.
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