题目内容
| 递等式计算(能简便的要简便). (2-0.6)÷
|
|
(
| ||||||||||||||||
4.42÷
|
27÷(
|
分析:算式(1)(2)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;
算式(3)(4)可根据乘法分配律计算;
算式(5)可根据乘法交换律进行计算.
算式(3)(4)可根据乘法分配律计算;
算式(5)可根据乘法交换律进行计算.
解答:解:(1)(2-0.6)÷
+
,
=1.4×
+
,
=3+2
,
=5
;
(2)
+(
-
)×
,
=
+
×
,
=
+
,
=
;
(3)(
+
)×13×24,
=
×13×24+
×13×24,
=168+65,
=233;
(4)4.42÷
+4.58×
+3÷4,
=4.42×
+4.58×
+
,
=(4.42+4.58+1)×
,
=10×
,
=7.5;
(5)27÷(
+
)÷
,
=27×
÷
,
=33×
,
=45.
| 7 |
| 15 |
| 9 |
| 4 |
=1.4×
| 15 |
| 7 |
| 9 |
| 4 |
=3+2
| 1 |
| 4 |
=5
| 1 |
| 4 |
(2)
| 2 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
| 5 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 15 |
| 5 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 9 |
=
| 8 |
| 9 |
(3)(
| 7 |
| 13 |
| 5 |
| 24 |
=
| 7 |
| 13 |
| 5 |
| 24 |
=168+65,
=233;
(4)4.42÷
| 4 |
| 3 |
| 3 |
| 4 |
=4.42×
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
=(4.42+4.58+1)×
| 3 |
| 4 |
=10×
| 3 |
| 4 |
=7.5;
(5)27÷(
| 1 |
| 3 |
| 2 |
| 5 |
| 9 |
| 11 |
=27×
| 11 |
| 9 |
| 11 |
| 15 |
=33×
| 15 |
| 11 |
=45.
点评:完成此类题目要认真分析式中数据的特点及内在联系,然后选择合适的方法计算.
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