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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