题目内容
计算下列各题,能简算的要简算.
|
| 16×
| 0.3×
| |||||||||||||||||||||
(
|
|
|
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)先算乘法,再算减法;
(2)运用乘法交换律与结合律简算;
(3)把16看作15+1,运用乘法分配律简算;
(4)约分计算;
(5)(6)(7)运用乘法分配律简算.
(2)运用乘法交换律与结合律简算;
(3)把16看作15+1,运用乘法分配律简算;
(4)约分计算;
(5)(6)(7)运用乘法分配律简算.
解答:
解:(1)
×
-
=
-
=0
(2)
×(8+15)×
=(
×
)×23
=
×23
=
(3)16×
=(15+1)×
=15×
+
=9+
=9
(4)0.3×
=0.2
(5)(
+
)×16
=
×16+
×16
=12+10
=22
(6)
×
+
×
=
×(
+
)
=
×1
=
(7)
×
+
×
+
=
×(
+
+1)
=
×2
=
| 5 |
| 9 |
| 3 |
| 10 |
| 1 |
| 6 |
=
| 1 |
| 6 |
| 1 |
| 6 |
=0
(2)
| 3 |
| 8 |
| 1 |
| 3 |
=(
| 3 |
| 8 |
| 1 |
| 3 |
=
| 1 |
| 8 |
=
| 23 |
| 8 |
(3)16×
| 9 |
| 15 |
=(15+1)×
| 9 |
| 15 |
=15×
| 9 |
| 15 |
| 9 |
| 15 |
=9+
| 9 |
| 15 |
=9
| 9 |
| 15 |
(4)0.3×
| 2 |
| 3 |
(5)(
| 3 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 5 |
| 8 |
=12+10
=22
(6)
| 5 |
| 7 |
| 3 |
| 4 |
| 5 |
| 7 |
| 1 |
| 4 |
=
| 5 |
| 7 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
(7)
| 2 |
| 3 |
| 4 |
| 7 |
| 2 |
| 3 |
| 3 |
| 7 |
| 2 |
| 3 |
=
| 2 |
| 3 |
| 4 |
| 7 |
| 3 |
| 7 |
=
| 2 |
| 3 |
=
| 4 |
| 3 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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