题目内容
(2013?江岸区)脱式计算.步步为“赢”,胜利一定属于你!
| 35×140-2987 | (
|
| ||||||||||||||
| 0.34×5+0.96÷32 | (
|
|
分析:(1)先算乘法,再算减法;
(2)根据乘法分配律进行简算;
(3)先算减法,再算除法;
(4)先算乘法和除法,再算减法;
(5)先算减法,再算除法;
(6)先算加法,再算乘法,最后算除法.
(2)根据乘法分配律进行简算;
(3)先算减法,再算除法;
(4)先算乘法和除法,再算减法;
(5)先算减法,再算除法;
(6)先算加法,再算乘法,最后算除法.
解答:解:
(1)35×140-2987,
=4900-2987,
=1913;
(2)(
+
)×35,
=
×35+
×35,
=10+7,
=17;
(3)
÷(
-
),
=
÷
,
=
;
(4)0.34×5+0.96÷32,
=1.7+0.03,
=1.73;
(5)(
-
)÷
,
=
÷
,
=
;
(6)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
.
(1)35×140-2987,
=4900-2987,
=1913;
(2)(
| 2 |
| 7 |
| 1 |
| 5 |
=
| 2 |
| 7 |
| 1 |
| 5 |
=10+7,
=17;
(3)
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 5 |
| 7 |
| 7 |
| 15 |
=
| 75 |
| 49 |
(4)0.34×5+0.96÷32,
=1.7+0.03,
=1.73;
(5)(
| 5 |
| 6 |
| 1 |
| 8 |
| 5 |
| 12 |
=
| 17 |
| 24 |
| 5 |
| 12 |
=
| 17 |
| 10 |
(6)
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
=
| 9 |
| 20 |
| 1 |
| 2 |
| 6 |
| 5 |
=
| 9 |
| 20 |
| 3 |
| 5 |
=
| 3 |
| 4 |
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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