题目内容
(2012?武定县模拟)
| 怎样算简便就怎样算. 356-199= 157 157 ; |
(
0 0 ; |
32×12.5×0.25= 100 100 ; | ||||||||||||||||||||
2 2 ; |
0.11 0.11 ; |
|
分析:(1)356-199,根据减法的运算性质进行简算;
(2)(
+
-
)×12,运用乘法分配律进行简算;
(3)32×12.5×0.25,首先把32分解为4×8,再运用乘法交换律和结合律进行简算;
(4)
+
+
+
,运用加法交换律和结合律进行简算;
(5)
×0.11+0.11×
,运用乘法分配律进行简算;
(6)
÷[(
-
)÷
],根据分数四则混合运算的顺序,按照分数四则运算的计算法则进行计算.
(2)(
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
(3)32×12.5×0.25,首先把32分解为4×8,再运用乘法交换律和结合律进行简算;
(4)
| 2 |
| 5 |
| 4 |
| 9 |
| 3 |
| 5 |
| 5 |
| 9 |
(5)
| 4 |
| 9 |
| 5 |
| 9 |
(6)
| 6 |
| 5 |
| 3 |
| 4 |
| 2 |
| 3 |
| 5 |
| 6 |
解答:解:(1)356-199,
=356-200+1,
=157;
(2)(
+
-
)×12,
=
×12+
×12-
×12,
=6+4-10,
=0;
(3)32×12.5×0.25,
=(8×12.5)×(4×0.25),
=100×1,
=100;
(4)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(5)
×0.11+0.11×
,
=(
+
)×0.11,
=1×0.11,
=0.11;
(6)
÷[(
-
)÷
],
=
÷[
×
],
=
÷
,
=
×10,
=12.
=356-200+1,
=157;
(2)(
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
=6+4-10,
=0;
(3)32×12.5×0.25,
=(8×12.5)×(4×0.25),
=100×1,
=100;
(4)
| 2 |
| 5 |
| 4 |
| 9 |
| 3 |
| 5 |
| 5 |
| 9 |
=(
| 2 |
| 5 |
| 3 |
| 5 |
| 4 |
| 9 |
| 5 |
| 9 |
=1+1,
=2;
(5)
| 4 |
| 9 |
| 5 |
| 9 |
=(
| 4 |
| 9 |
| 5 |
| 9 |
=1×0.11,
=0.11;
(6)
| 6 |
| 5 |
| 3 |
| 4 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 6 |
| 5 |
| 1 |
| 12 |
| 6 |
| 5 |
=
| 6 |
| 5 |
| 1 |
| 10 |
=
| 6 |
| 5 |
=12.
点评:此题考查的目的是使学生灵活运用整数的运算定律和运算性质对小数、分数四则混合运算进行简便计算.
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