题目内容
脱式计算.(能简算的要简算)
|
12.04-5.37-4.63 | ||||||||||||||
|
| ||||||||||||||
| 32×71.1+28.9×32 | (
|
分析:(1)运用加法交换律和结合律即可解答,
(2)依据减法性质解答,
(3)(5)运用乘法分配律解答,
(4)(6)按照四则运算计算顺序解答.
(2)依据减法性质解答,
(3)(5)运用乘法分配律解答,
(4)(6)按照四则运算计算顺序解答.
解答:解:(1)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(2)12.04-5.37-4.63,
=12.04-(5.37+4.63),
=12.04-10,
=2.04;
(3)(
+
+
)×30,
=
×30+
×30+
×30,
=24+5+8,
=29+8,
=37;
(4)
×[
÷(
×
)],
=
×[
÷
],
=
×
,
=
;
(5)32×71.1+28.9×32,
=(71.1+28.9)×32,
=100×32,
=3200;
(6)(
+
)÷(
÷4-
),
=
÷(
-
),
=
÷
,
=7.5.
| 3 |
| 8 |
| 4 |
| 9 |
| 5 |
| 8 |
| 5 |
| 9 |
=(
| 3 |
| 8 |
| 5 |
| 8 |
| 4 |
| 9 |
| 5 |
| 9 |
=1+1,
=2;
(2)12.04-5.37-4.63,
=12.04-(5.37+4.63),
=12.04-10,
=2.04;
(3)(
| 4 |
| 5 |
| 1 |
| 6 |
| 4 |
| 15 |
=
| 4 |
| 5 |
| 1 |
| 6 |
| 4 |
| 15 |
=24+5+8,
=29+8,
=37;
(4)
| 1 |
| 8 |
| 1 |
| 2 |
| 3 |
| 5 |
| 10 |
| 9 |
=
| 1 |
| 8 |
| 1 |
| 2 |
| 2 |
| 3 |
=
| 1 |
| 8 |
| 3 |
| 4 |
=
| 3 |
| 32 |
(5)32×71.1+28.9×32,
=(71.1+28.9)×32,
=100×32,
=3200;
(6)(
| 1 |
| 2 |
| 1 |
| 4 |
| 4 |
| 5 |
| 1 |
| 10 |
=
| 3 |
| 4 |
| 1 |
| 5 |
| 1 |
| 10 |
=
| 3 |
| 4 |
| 1 |
| 10 |
=7.5.
点评:本题考查知识点:(1)四则运算计算顺序,(2)简便算法正确运用.
练习册系列答案
相关题目