题目内容
怎样算简便就怎样算.
23-
-
44×(
-
)
(
-
×
)÷
6×
+13÷4-19×
[
-(
-
)]÷4.
23-
12 |
17 |
5 |
17 |
44×(
5 |
11 |
1 |
4 |
(
17 |
5 |
8 |
3 |
3 |
4 |
24 |
5 |
6×
1 |
4 |
1 |
4 |
[
3 |
5 |
3 |
4 |
2 |
5 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据减法的性质简算;
(2)(4)运用乘法分配律简算;
(3)先算乘法,再算减法,最后算除法;
(5)中括号内利用减法的性质及加法交换律简算,最后算除法.
(2)(4)运用乘法分配律简算;
(3)先算乘法,再算减法,最后算除法;
(5)中括号内利用减法的性质及加法交换律简算,最后算除法.
解答:
解:(1)23-
-
=23-(
+
)
=23-1
=22;
(2)44×(
-
)
=44×
-44×
=20-11
=9;
(3)(
-
×
)÷
=(
-2)÷
=
÷
=
;
(4)6×
+13÷4-19×
=6×
+13×
-19×
=
×(6+13-19)
=0;
(5)[
-(
-
)]÷4
=[
-
+
)]÷4
=[
+
-
]÷4
=
÷4
=
.
12 |
17 |
5 |
17 |
=23-(
12 |
17 |
5 |
17 |
=23-1
=22;
(2)44×(
5 |
11 |
1 |
4 |
=44×
5 |
11 |
1 |
4 |
=20-11
=9;
(3)(
17 |
5 |
8 |
3 |
3 |
4 |
24 |
5 |
=(
17 |
5 |
24 |
5 |
=
7 |
5 |
24 |
5 |
=
7 |
24 |
(4)6×
1 |
4 |
1 |
4 |
=6×
1 |
4 |
1 |
4 |
1 |
4 |
=
1 |
4 |
=0;
(5)[
3 |
5 |
3 |
4 |
2 |
5 |
=[
3 |
5 |
3 |
4 |
2 |
5 |
=[
3 |
5 |
2 |
5 |
3 |
4 |
=
1 |
4 |
=
1 |
16 |
点评:混合运算的关键是抓住运算顺序,正确按运算顺序计算,合理利用运算定律简算即可.
练习册系列答案
相关题目