题目内容
计算下面各题,能简算要简算
(
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| 10.5×9.5 | ||||||||||||||||||
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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)(4)(5)(6)运用乘法分配律解答,
(2)(7)(8)按照从左到右顺序计算解答,
(3)按照先算括号里面的,再算括号外面的顺序计算解答.
(2)(7)(8)按照从左到右顺序计算解答,
(3)按照先算括号里面的,再算括号外面的顺序计算解答.
解答:
解:(1)(
-
)×24
=
×24-
×24
=15-8
=7;
(2)
×42×
=15×
=9;
(3)
×(
×
)
=
×
=
;
(4)10.5×9.5
=10×9.5+0.5×9.5
=95+4.75
=99.75;
(5)
×103-
×2-
=
×(103-2-1)
=
×100
=28;
(6)
×
+
×
+
×
=(
+
+
)×
=1×
=
;
(7)
÷12×
=
×
=
;
(8)
÷
÷
=
÷
=
.
| 5 |
| 8 |
| 1 |
| 3 |
=
| 5 |
| 8 |
| 1 |
| 3 |
=15-8
=7;
(2)
| 5 |
| 14 |
| 3 |
| 5 |
=15×
| 3 |
| 5 |
=9;
(3)
| 5 |
| 16 |
| 9 |
| 10 |
| 4 |
| 15 |
=
| 5 |
| 16 |
| 6 |
| 25 |
=
| 3 |
| 40 |
(4)10.5×9.5
=10×9.5+0.5×9.5
=95+4.75
=99.75;
(5)
| 7 |
| 25 |
| 7 |
| 25 |
| 7 |
| 25 |
=
| 7 |
| 25 |
=
| 7 |
| 25 |
=28;
(6)
| 1 |
| 17 |
| 3 |
| 4 |
| 3 |
| 17 |
| 1 |
| 2 |
| 8 |
| 17 |
| 3 |
| 32 |
=(
| 1 |
| 4 |
| 1 |
| 2 |
| 8 |
| 32 |
| 3 |
| 17 |
=1×
| 3 |
| 17 |
=
| 3 |
| 17 |
(7)
| 24 |
| 35 |
| 5 |
| 6 |
=
| 2 |
| 35 |
| 5 |
| 6 |
=
| 1 |
| 21 |
(8)
| 3 |
| 4 |
| 15 |
| 16 |
| 5 |
| 6 |
=
| 4 |
| 5 |
| 5 |
| 6 |
=
| 24 |
| 25 |
点评:本题考查知识点:(1)依据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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