题目内容
计算下面各题,能简算的要简算.
×
×75
×
×75×
×0.49+
×0.51
48×(
+
-
)
| 1 |
| 75 |
| 7 |
| 18 |
| 1 |
| 5 |
| 1 |
| 10 |
| 7 |
| 45 |
| 13 |
| 3 |
| 13 |
| 3 |
48×(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 12 |
分析:(1)根据乘法交换律进行计算;
(2)根据乘法交换律和结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算.
(2)根据乘法交换律和结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算.
解答:解:
(1)
×
×75,
=
×75×
,
=1×
,
=
;
(2)
×
×75×
,
=(
×75)×(
×
),
=15×
,
=
;
(3)
×0.49+
×0.51,
=
×(0.49+0.51),
=
×1,
=
;
(4)48×(
+
-
),
=48×
+48×
-48×
,
=24+16-4,
=40-4,
=36.
(1)
| 1 |
| 75 |
| 7 |
| 18 |
=
| 1 |
| 75 |
| 7 |
| 18 |
=1×
| 7 |
| 18 |
=
| 7 |
| 18 |
(2)
| 1 |
| 5 |
| 1 |
| 10 |
| 7 |
| 45 |
=(
| 1 |
| 5 |
| 1 |
| 10 |
| 7 |
| 45 |
=15×
| 7 |
| 450 |
=
| 7 |
| 30 |
(3)
| 13 |
| 3 |
| 13 |
| 3 |
=
| 13 |
| 3 |
=
| 13 |
| 3 |
=
| 13 |
| 3 |
(4)48×(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 12 |
=48×
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 12 |
=24+16-4,
=40-4,
=36.
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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