题目内容
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1÷
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4
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(
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分析:(1)根据乘法交换律进行简算;
(2)先算加法,再算除法;
(3)先算加法,再算除法;
(4)按照从左向右的顺序进行计算;
(5)按照从左向右的顺序进行计算;
(6)先算乘法,再算减法;
(7)把分数化成小数,然后再计算;
(8)按照从左向右的顺序进行计算;
(9)根据乘法分配律进行简算;
(10)按照从左向右的顺序进行计算.
(2)先算加法,再算除法;
(3)先算加法,再算除法;
(4)按照从左向右的顺序进行计算;
(5)按照从左向右的顺序进行计算;
(6)先算乘法,再算减法;
(7)把分数化成小数,然后再计算;
(8)按照从左向右的顺序进行计算;
(9)根据乘法分配律进行简算;
(10)按照从左向右的顺序进行计算.
解答:解:
(1)
×14÷
,
=
÷
×14,
=
×14,
=2;
(2)(
+
)÷
,
=
÷
,
=
;
(3)
÷(
+
),
=
÷
,
=
;
(4)
÷
÷
,
=
÷
,
=
;
(5)1÷
÷
,
=100÷
,
=10000;
(6)4
×4
-4,
=22
-4,
=18
;
(7)
×3.6
=0.8×3.6,
=2.88;
(8)
÷
÷
,
=
÷
,
=
;
(9)(
+
)÷
,
=(
+
)×
,
=
×
+
×
,
=
+1,
=
;
(10)
÷0.2×
,
=
×
,
=
.
(1)
| 1 |
| 8 |
| 7 |
| 8 |
=
| 1 |
| 8 |
| 7 |
| 8 |
=
| 1 |
| 7 |
=2;
(2)(
| 4 |
| 5 |
| 3 |
| 10 |
| 3 |
| 10 |
=
| 11 |
| 10 |
| 3 |
| 10 |
=
| 11 |
| 3 |
(3)
| 5 |
| 6 |
| 1 |
| 2 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 4 |
| 3 |
=
| 5 |
| 8 |
(4)
| 3 |
| 4 |
| 15 |
| 16 |
| 5 |
| 6 |
=
| 4 |
| 5 |
| 5 |
| 6 |
=
| 24 |
| 25 |
(5)1÷
| 1 |
| 100 |
| 1 |
| 100 |
=100÷
| 1 |
| 100 |
=10000;
(6)4
| 4 |
| 5 |
| 3 |
| 5 |
=22
| 2 |
| 25 |
=18
| 2 |
| 25 |
(7)
| 4 |
| 5 |
=0.8×3.6,
=2.88;
(8)
| 3 |
| 4 |
| 7 |
| 8 |
| 15 |
| 14 |
=
| 6 |
| 7 |
| 15 |
| 14 |
=
| 4 |
| 5 |
(9)(
| 4 |
| 9 |
| 2 |
| 15 |
| 2 |
| 15 |
=(
| 4 |
| 9 |
| 2 |
| 15 |
| 15 |
| 2 |
=
| 4 |
| 9 |
| 15 |
| 2 |
| 2 |
| 15 |
| 15 |
| 2 |
=
| 10 |
| 3 |
=
| 13 |
| 3 |
(10)
| 3 |
| 20 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 2 |
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律简便计算.
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