题目内容
计算下面各题,怎样简便就怎样算.
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6×(
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分析:(1)(2)(6)运用乘法分配律解答,
(3)按照先算括号里面的,再算括号外面的顺序解答,
(4)按照先算除法,再算加法顺序解答,
(5)按照从左到右顺序计算即可解答.
(3)按照先算括号里面的,再算括号外面的顺序解答,
(4)按照先算除法,再算加法顺序解答,
(5)按照从左到右顺序计算即可解答.
解答:解:(1)
×
+
×
=
×(
+
)
=
×1
=
;
(2)
÷
+
÷
=(
+
)×
=1×
=1
;
(3)
÷(
-
)
=
÷
=4
;
(4)
+
÷
=
+
=
;
(5)
×
÷
=
÷
=4;
(6)6×(
+
)÷
=(6×
+6×
)÷
=(
+5)÷
=
÷
=1
.
7 |
13 |
3 |
4 |
3 |
4 |
6 |
13 |
=
3 |
4 |
7 |
13 |
6 |
13 |
=
3 |
4 |
=
3 |
4 |
(2)
3 |
7 |
7 |
11 |
4 |
7 |
7 |
11 |
=(
3 |
7 |
4 |
7 |
11 |
7 |
=1×
11 |
7 |
=1
4 |
7 |
(3)
12 |
7 |
2 |
3 |
1 |
4 |
=
12 |
7 |
5 |
12 |
=4
4 |
35 |
(4)
5 |
9 |
5 |
9 |
5 |
3 |
=
5 |
9 |
1 |
3 |
=
8 |
9 |
(5)
16 |
5 |
1 |
2 |
2 |
5 |
=
8 |
5 |
2 |
5 |
=4;
(6)6×(
7 |
9 |
5 |
6 |
29 |
5 |
=(6×
7 |
9 |
5 |
6 |
29 |
5 |
=(
14 |
3 |
29 |
5 |
=
29 |
3 |
29 |
5 |
=1
2 |
3 |
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用乘法分配律解决问题,是本题考查知识点.
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