题目内容
灵活计算下面各题 (1)1800×(308-146)÷900 |
(2)
| ||||||||
(3)28.75×6.3-8.75×6.3 | (4)4×0.6+0.6÷
|
分析:(1)先算小括号里面的减法,然后运用乘法交换律简算;
(2)先算除法,再算加法;
(3)运用乘法分配律简算;
(4)先把除法变成乘法,再运用乘法分配律简算.
(2)先算除法,再算加法;
(3)运用乘法分配律简算;
(4)先把除法变成乘法,再运用乘法分配律简算.
解答:解:(1)1800×(308-146)÷900,
=1800×162÷900,
=1800÷900×162,
=2×162,
=324;
(2)
+
÷2,
=
+
,
=
;
(3)28.75×6.3-8.75×6.3,
=(28.75-8.75)×6.3,
=20×6.3,
=126;
(4)4×0.6+0.6÷
,
=(4+4)×0.6,
=8×0.6,
=4.8.
=1800×162÷900,
=1800÷900×162,
=2×162,
=324;
(2)
1 | ||||
|
2 |
3 |
=
1 |
3 |
1 |
3 |
=
2 |
3 |
(3)28.75×6.3-8.75×6.3,
=(28.75-8.75)×6.3,
=20×6.3,
=126;
(4)4×0.6+0.6÷
1 |
4 |
=(4+4)×0.6,
=8×0.6,
=4.8.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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