题目内容
计算(能简算的要简算)
(1)24×
(2)
×(
÷
)
(3)(
-
)×
(4)
×
+
×
(5)
÷[(
+
)×
]
(6)
×
+
÷
.
(1)24×
5 |
12 |
(2)
3 |
4 |
1 |
2 |
5 |
8 |
(3)(
7 |
8 |
1 |
2 |
2 |
3 |
(4)
2 |
5 |
7 |
9 |
7 |
9 |
3 |
5 |
(5)
2 |
7 |
2 |
3 |
1 |
4 |
6 |
11 |
(6)
5 |
8 |
8 |
15 |
3 |
4 |
3 |
2 |
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
分析:(1)约分计算.
(2)(3)先算括号内的,再算括号外的.
(4)运用乘法分配律简算.
(5)先算小括号内的,再算中括号内的,最后算括号外的.
(6)先算乘法和除法,再算加法.
(2)(3)先算括号内的,再算括号外的.
(4)运用乘法分配律简算.
(5)先算小括号内的,再算中括号内的,最后算括号外的.
(6)先算乘法和除法,再算加法.
解答:
解:(1)24×
=10
(2)
×(
÷
)
=
×(
×
)
=
×
=
(3)(
-
)×
=
×
=
(4))
×
+
×
=(
+
)×
=1×
=
(5)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=
(6)
×
+
÷
=
+
×
=
+
=
5 |
12 |
(2)
3 |
4 |
1 |
2 |
5 |
8 |
=
3 |
4 |
1 |
2 |
8 |
5 |
=
3 |
4 |
4 |
5 |
=
3 |
5 |
(3)(
7 |
8 |
1 |
2 |
2 |
3 |
=
3 |
8 |
2 |
3 |
=
1 |
4 |
(4))
2 |
5 |
7 |
9 |
7 |
9 |
3 |
5 |
=(
2 |
5 |
3 |
5 |
7 |
9 |
=1×
7 |
9 |
=
7 |
9 |
(5)
2 |
7 |
2 |
3 |
1 |
4 |
6 |
11 |
=
2 |
7 |
11 |
12 |
6 |
11 |
=
2 |
7 |
1 |
2 |
=
4 |
7 |
(6)
5 |
8 |
8 |
15 |
3 |
4 |
3 |
2 |
=
1 |
3 |
3 |
4 |
2 |
3 |
=
1 |
3 |
1 |
2 |
=
5 |
6 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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