题目内容
递等式计算.
4.7+3.2×0.4÷1.6
13×65+16892÷82
(2-
)÷(
+
)
[1(
+
)]÷0.25.
4.7+3.2×0.4÷1.6
13×65+16892÷82
(2-
3 |
5 |
1 |
12 |
4 |
15 |
[1(
3 |
4 |
3 |
8 |
分析:(1)可根据乘法交换律计算;
(2)(3)(4)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)(3)(4)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)4.7+3.2×0.4÷1.6
=4.7+3.2÷1.6×0.4,
=4.7+2×0.4,
=4.7+0.8,
=5.5;
(2)13×65+16892÷82
=845+206,
=1051;
(3)(2-
)÷(
+
)
=
÷
,
=4;
(4)[1×(
+
)]÷0.25
=[1×
]÷
,
=
×4,
=
.
=4.7+3.2÷1.6×0.4,
=4.7+2×0.4,
=4.7+0.8,
=5.5;
(2)13×65+16892÷82
=845+206,
=1051;
(3)(2-
3 |
5 |
1 |
12 |
4 |
15 |
=
7 |
5 |
7 |
20 |
=4;
(4)[1×(
3 |
4 |
3 |
8 |
=[1×
9 |
8 |
1 |
4 |
=
9 |
8 |
=
9 |
2 |
点评:在运用递等式计算时,要注意计算过程的完整性,中间不要有太大跳跃.
练习册系列答案
相关题目