题目内容
脱式计算
÷
×
10÷
+
×3
20-
÷
×
(
-
×
)÷
.
| 7 |
| 16 |
| 3 |
| 20 |
| 12 |
| 35 |
| 4 |
| 7 |
| 1 |
| 6 |
20-
| 8 |
| 9 |
| 1 |
| 3 |
| 4 |
| 7 |
| 5 |
| 7 |
| 3 |
| 14 |
| 1 |
| 3 |
| 15 |
| 49 |
分析:(1)先把除法转化为乘法,再进行计算,
(2)先算乘除,再算加法,
(3)先把除法转化为乘法,再求积,最后求差,
(5)先算括号里面的乘法,再算括号里面的减法,最后算除法.
(2)先算乘除,再算加法,
(3)先把除法转化为乘法,再求积,最后求差,
(5)先算括号里面的乘法,再算括号里面的减法,最后算除法.
解答:解:(1)
÷
×
,
=
×
×
,
=1;
(2)10÷
+
×3,
=
+
,
=18;
(3)20-
÷
×
,
=20-
×3×
,
=20-
,
=18
.
(4)(
-
×
)÷
,
=(
-
)÷
,
=
÷
,
=
.
| 7 |
| 16 |
| 3 |
| 20 |
| 12 |
| 35 |
=
| 7 |
| 16 |
| 20 |
| 3 |
| 12 |
| 35 |
=1;
(2)10÷
| 4 |
| 7 |
| 1 |
| 6 |
=
| 35 |
| 2 |
| 1 |
| 2 |
=18;
(3)20-
| 8 |
| 9 |
| 1 |
| 3 |
| 4 |
| 7 |
=20-
| 8 |
| 9 |
| 4 |
| 7 |
=20-
| 32 |
| 21 |
=18
| 10 |
| 21 |
(4)(
| 5 |
| 7 |
| 3 |
| 14 |
| 1 |
| 3 |
| 15 |
| 49 |
=(
| 5 |
| 7 |
| 1 |
| 14 |
| 15 |
| 49 |
=
| 9 |
| 14 |
| 15 |
| 49 |
=
| 21 |
| 10 |
点评:本题主要考查了学生分数四则运算的能力,以及在计算中灵活运用简便算法的能力,注意要细心.
练习册系列答案
相关题目