题目内容
能简便的要用简便方法计算.
0.16+4÷(
-
)
70.8-9.28-0.72
× [
÷(
-
)]
60.5×6.5+6.05×35.
0.16+4÷(
3 |
8 |
1 |
8 |
70.8-9.28-0.72
7 |
12 |
4 |
15 |
5 |
6 |
4 |
5 |
60.5×6.5+6.05×35.
分析:算式(1)(3)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(2)可根据一个数减两个数,等于用这个数减去这两个数的和的减法性质进行计算;
算式(4)可先根据乘法算式的性质将60.5×6.5变为6.05×65后,再据乘法分配律计算.
算式(2)可根据一个数减两个数,等于用这个数减去这两个数的和的减法性质进行计算;
算式(4)可先根据乘法算式的性质将60.5×6.5变为6.05×65后,再据乘法分配律计算.
解答:解:(1)0.16+4÷(
-
),
=0.16+4÷
,
=0.16+4×4,
=0.16+16,
=16.16;
(2)70.8-9.28-0.72,
=70.8-(9.28+0.72),
=70.8-10,
=60.8;
(3)
×[
÷(
-
)],
=
×[
÷
]
=
×8,
=
;
(4)60.5×6.5+6.05×35,
=6.05×65+6.05×35,
=(65+35)×6.05,
=100×6.05,
=605.
3 |
8 |
1 |
8 |
=0.16+4÷
1 |
4 |
=0.16+4×4,
=0.16+16,
=16.16;
(2)70.8-9.28-0.72,
=70.8-(9.28+0.72),
=70.8-10,
=60.8;
(3)
7 |
12 |
4 |
15 |
5 |
6 |
4 |
5 |
=
7 |
12 |
4 |
15 |
1 |
30 |
=
7 |
12 |
=
14 |
3 |
(4)60.5×6.5+6.05×35,
=6.05×65+6.05×35,
=(65+35)×6.05,
=100×6.05,
=605.
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,然后运用合适的方法进行计算.
练习册系列答案
相关题目