题目内容
| 下面各题,怎样算简便就怎样算: 4296-1296÷12+812 |
51÷0.17+2.6×6 |
| ||||||||||||||||
|
125×0.32×25 |
|
分析:(1)先算除法,再算减法,最后算加法;
(2)先同时运算乘法和乘法,再算加法;
(3)先算乘法,再算除法,最后算加法;
(4)运用运用乘法分配律简算;
(5)先把0.32分解成0.8×0.4,再运用乘法结合律简算;
(6)先算小括号里面的加法,再算括号外的除法,最后算乘法.
(2)先同时运算乘法和乘法,再算加法;
(3)先算乘法,再算除法,最后算加法;
(4)运用运用乘法分配律简算;
(5)先把0.32分解成0.8×0.4,再运用乘法结合律简算;
(6)先算小括号里面的加法,再算括号外的除法,最后算乘法.
解答:解:(1)4296-1296÷12+812,
=4296-108+812,
=4188+812,
=5000;
(2)51÷0.17+2.6×6,
=300+15.6,
=315.6;
(3)
×
÷
+
,
=
÷
+
,
=
+
,
=
;
(4)
×
+
÷
,
=(
+
)×
,
=1×
,
=
;
(5)125×0.32×25,
=125×0.8×0.4×25,
=(125×0.8)×(0.4×25),
=100×10,
=1000;
(6)
÷(
+
)×
,
=
÷
×
,
=
×
×
,
=
×
,
=
.
=4296-108+812,
=4188+812,
=5000;
(2)51÷0.17+2.6×6,
=300+15.6,
=315.6;
(3)
| 5 |
| 3 |
| 3 |
| 10 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 1 |
| 2 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 3 |
| 5 |
| 1 |
| 6 |
=
| 23 |
| 30 |
(4)
| 4 |
| 7 |
| 5 |
| 18 |
| 3 |
| 7 |
| 18 |
| 5 |
=(
| 4 |
| 7 |
| 3 |
| 7 |
| ?5 |
| 18 |
=1×
| 5 |
| 18 |
=
| 5 |
| 18 |
(5)125×0.32×25,
=125×0.8×0.4×25,
=(125×0.8)×(0.4×25),
=100×10,
=1000;
(6)
| 3 |
| 7 |
| 2 |
| 3 |
| 11 |
| 6 |
| 3 |
| 10 |
=
| 3 |
| 7 |
| 15 |
| 6 |
| 3 |
| 10 |
=
| 3 |
| 7 |
| 2 |
| 5 |
| 3 |
| 10 |
=
| 6 |
| 35 |
| 3 |
| 10 |
=
| 9 |
| 175 |
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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