题目内容
计算下列各题,能简算的要简算
(
|
3-
|
|
19÷[(
|
分析:(1)根据乘法分配律进行计算;
(2)先算除法,再根据连减的性质进行计算;
(3)根据乘法分配律进行计算;
(4)先算加法,再算乘法,最后算除法.
(2)先算除法,再根据连减的性质进行计算;
(3)根据乘法分配律进行计算;
(4)先算加法,再算乘法,最后算除法.
解答:解:
(1)(
+
-
)×24,
=
×24+
×24-
×24,
=8+6-1,
=13;
(2)3-
÷
-
,
=3-
-
,
=3-(
+
),
=3-1,
=2;
(3)
×
+
÷7,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)19÷[(
+
)×
],
=19÷[
×
],
=19÷
,
=24.
(1)(
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 24 |
=
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 24 |
=8+6-1,
=13;
(2)3-
| 3 |
| 2 |
| 21 |
| 10 |
| 2 |
| 7 |
=3-
| 5 |
| 7 |
| 2 |
| 7 |
=3-(
| 5 |
| 7 |
| 2 |
| 7 |
=3-1,
=2;
(3)
| 3 |
| 4 |
| 1 |
| 7 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 7 |
| 1 |
| 4 |
| 1 |
| 7 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(4)19÷[(
| 1 |
| 5 |
| 3 |
| 4 |
| 5 |
| 6 |
=19÷[
| 19 |
| 20 |
| 5 |
| 6 |
=19÷
| 19 |
| 24 |
=24.
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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