题目内容
计算,能简算的要简算.
|
1-
|
48×(
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)把除法变为乘法,运用乘法分配律简算.
(2)先算除法,然后运用减法的性质简算.
(3)运用乘法分配律简算.
(2)先算除法,然后运用减法的性质简算.
(3)运用乘法分配律简算.
解答:
解:(1)
×
-
÷
=
×
-
×
=(
-
)×
=
×
=
(2)1-
÷
-
=1-
×
-
=1-
-
=1-(
+
)
=1-1
=0
(3)48×(
-
+
)
=48×
-48×
+48×
=32-24+36
=44
4 |
5 |
5 |
6 |
3 |
5 |
6 |
5 |
=
4 |
5 |
5 |
6 |
3 |
5 |
5 |
6 |
=(
4 |
5 |
3 |
5 |
5 |
6 |
=
1 |
5 |
5 |
6 |
=
1 |
6 |
(2)1-
5 |
8 |
25 |
28 |
3 |
10 |
=1-
5 |
8 |
28 |
25 |
3 |
10 |
=1-
7 |
10 |
3 |
10 |
=1-(
7 |
10 |
3 |
10 |
=1-1
=0
(3)48×(
2 |
3 |
1 |
2 |
3 |
4 |
=48×
2 |
3 |
1 |
2 |
3 |
4 |
=32-24+36
=44
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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