题目内容
计算下面各题,能简便的要简便.
(1)[
÷(
+
)]×
(2)15÷
+15×
(3)
÷[
÷(
-
)]
(4)3-
×
-
(5)75×60%+24×
+0.6
(6)
×
÷(
-
)
(1)[
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
(2)15÷
| 8 |
| 9 |
| 7 |
| 8 |
(3)
| 3 |
| 22 |
| 5 |
| 4 |
| 14 |
| 3 |
| 1 |
| 2 |
(4)3-
| 5 |
| 18 |
| 27 |
| 40 |
| 13 |
| 16 |
(5)75×60%+24×
| 3 |
| 5 |
(6)
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 3 |
| 2 |
| 3 |
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)(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计算解答,
(2)运用乘法分配律解答,
(4)运用减法性质解答,
(5)运用乘法分配律解答,
(6)按照先算括号里面的减法,再从左到右顺序计算解答.
(2)运用乘法分配律解答,
(4)运用减法性质解答,
(5)运用乘法分配律解答,
(6)按照先算括号里面的减法,再从左到右顺序计算解答.
解答:
解:(1)[
÷(
+
)]×
=[
÷
]×
=
×
=
;
(2)15÷
+15×
=15×(
+
)
=15×2
=30;
(3)
÷[
÷(
-
)]
=
÷[
÷
]
=
÷
=
;
(4)3-
×
-
=3-(
+
)
=3-1
=2;
(5)75×60%+24×
+0.6
=(75+24+1)×0.6
=100×0.6
=60;
(6)
×
÷(
-
)
=
×
÷
=
÷
=
.
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=[
| 4 |
| 9 |
| 1 |
| 2 |
| 3 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 4 |
=
| 2 |
| 3 |
(2)15÷
| 8 |
| 9 |
| 7 |
| 8 |
=15×(
| 9 |
| 8 |
| 7 |
| 8 |
=15×2
=30;
(3)
| 3 |
| 22 |
| 5 |
| 4 |
| 14 |
| 3 |
| 1 |
| 2 |
=
| 3 |
| 22 |
| 5 |
| 4 |
| 25 |
| 6 |
=
| 3 |
| 22 |
| 3 |
| 10 |
=
| 5 |
| 11 |
(4)3-
| 5 |
| 18 |
| 27 |
| 40 |
| 13 |
| 16 |
=3-(
| 3 |
| 16 |
| 13 |
| 16 |
=3-1
=2;
(5)75×60%+24×
| 3 |
| 5 |
=(75+24+1)×0.6
=100×0.6
=60;
(6)
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 3 |
| 2 |
| 3 |
=
| 1 |
| 6 |
| 2 |
| 3 |
| 2 |
| 3 |
=
| 1 |
| 9 |
| 2 |
| 3 |
=
| 1 |
| 6 |
点评:本题考查知识点:(1)以及四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题.
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