题目内容
脱式计算,能简算的要简算.
(
+
)÷
+
12×(
+
-
)
8.5-(5.6+4.8)÷1.3.
(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
12×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
8.5-(5.6+4.8)÷1.3.
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)可根据乘法分配律计算.
算式(2)可根据乘法分配律计算.
解答:解:(1)(
+
)÷
+
=(
+
)×
+
,
=
×
+
,
=
+
,
=
;
(2)12×(
+
-
)
=12×
+12×
-12×
,
=3+2-4,
=1;
(3)8.5-(5.6+4.8)÷1.3
=8.5-10.4÷1.3,
=8.5-8,
=0.5.
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=(
| 16 |
| 20 |
| 5 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 7 |
| 10 |
=
| 23 |
| 20 |
(2)12×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=12×
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=3+2-4,
=1;
(3)8.5-(5.6+4.8)÷1.3
=8.5-10.4÷1.3,
=8.5-8,
=0.5.
点评:完成脱式计算题目时要注意计算过程的完整性,中间不要有大的跳跃.
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