题目内容
计算怎样简便就怎样算.
|
24×(
| ||||||||||||||
7-(0.2+
|
(0.25×4-0.5)×4 | ||||||||||||||
(1-
|
|
分析:(1)可根据加法交换律及结合律计算;
(2)可根据乘法分配律计算;
(3)(4)(5)(6)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(2)可根据乘法分配律计算;
(3)(4)(5)(6)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)
+4.35+
+4.75
=(
+
)+(4.35+4.75),
=1+9,
=10;
(2)24×(
-
)
=24×
-24×
,
=6-3,
=3;
(3)7-(0.2+
)
=7-(0.2+0.8),
=7-1,
=6;
(4)(0.25×4-0.5)×4
=(1-0.5)×4,
=0.5×4,
=2;
(5)(1-
×
)÷
=(1-
)÷
,
=
×
,
=1;
(6)
÷[(
+
)×
]
=
÷[
×
],
=
×
,
=
.
| 1 |
| 6 |
| 5 |
| 6 |
=(
| 1 |
| 6 |
| 5 |
| 6 |
=1+9,
=10;
(2)24×(
| 1 |
| 4 |
| 1 |
| 8 |
=24×
| 1 |
| 4 |
| 1 |
| 8 |
=6-3,
=3;
(3)7-(0.2+
| 4 |
| 5 |
=7-(0.2+0.8),
=7-1,
=6;
(4)(0.25×4-0.5)×4
=(1-0.5)×4,
=0.5×4,
=2;
(5)(1-
| 1 |
| 4 |
| 8 |
| 9 |
| 7 |
| 9 |
=(1-
| 2 |
| 9 |
| 7 |
| 9 |
=
| 7 |
| 9 |
| 9 |
| 7 |
=1;
(6)
| 1 |
| 8 |
| 17 |
| 24 |
| 1 |
| 6 |
| 3 |
| 7 |
=
| 1 |
| 8 |
| 21 |
| 24 |
| 3 |
| 7 |
=
| 1 |
| 8 |
| 8 |
| 3 |
=
| 1 |
| 3 |
点评:完成本题要注意分析式中数据的特点及内在联系,然后运用合适的方法计算.
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