题目内容
脱式计算(用自己喜欢的方法计算)
(1)3-
|
(2)
|
(3)
| ||||||||||||||||||||
(4)18×(
|
(5)
|
(6)(
|
分析:(1)根据减法的性质简算;
(2)(4)(5)(6)运用乘法分配律简算;
(3)同时运算乘法和除法,再算加法.
(2)(4)(5)(6)运用乘法分配律简算;
(3)同时运算乘法和除法,再算加法.
解答:解:(1)3-
-
,
=3-(
+
),
=3-1,
=2;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)
×
+
÷
,
=
+
,
=
;
(4)18×(
+
),
=18×
+18×
,
=8+15,
=23;
(5)
×7+
×5,
=
×(7+5),
=
×12,
=8;
(6)(
-
)×24-
,
=
×24-
×24-
,
=4-2-
,
=2-
,
=1
.
| 7 |
| 12 |
| 5 |
| 12 |
=3-(
| 7 |
| 12 |
| 5 |
| 12 |
=3-1,
=2;
(2)
| 5 |
| 7 |
| 3 |
| 8 |
| 5 |
| 8 |
| 5 |
| 7 |
=
| 5 |
| 7 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
(3)
| 8 |
| 15 |
| 5 |
| 16 |
| 5 |
| 27 |
| 10 |
| 9 |
=
| 1 |
| 6 |
| 1 |
| 6 |
=
| 1 |
| 3 |
(4)18×(
| 4 |
| 9 |
| 5 |
| 6 |
=18×
| 4 |
| 9 |
| 5 |
| 6 |
=8+15,
=23;
(5)
| 2 |
| 3 |
| 2 |
| 3 |
=
| 2 |
| 3 |
=
| 2 |
| 3 |
=8;
(6)(
| 1 |
| 6 |
| 1 |
| 12 |
| 4 |
| 5 |
=
| 1 |
| 6 |
| 1 |
| 12 |
| 4 |
| 5 |
=4-2-
| 4 |
| 5 |
=2-
| 4 |
| 5 |
=1
| 1 |
| 5 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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| 102×4.5= | 4.5×7.3+2.7×4.5 | 0.85×0.4×2.5 |
| 8×(20-1.25) | 125×0.32×25 | (15.6+1.32÷0.3)×0.5. |
脱式计算(用自己喜欢的方法计算).
| 102×4.5= | 4.5×7.3+2.7×4.5 | 0.85×0.4×2.5 |
| 8×(20-1.25) | 125×0.32×25 | (15.6+1.32÷0.3)×0.5. |
脱式计算(用自己喜欢的方法计算)
| (1)3- | (2) | (3) |
| (4)18×( | (5) | (6)( |