题目内容
计算,能简算的要简算.
(1)
×0.25+
×
;
(2)
÷6+
×
;
(3)(
+
)×8+
;
(4)4-[3.75×(1.2-
)+
].
(1)
5 |
6 |
1 |
4 |
1 |
6 |
(2)
9 |
20 |
1 |
6 |
1 |
20 |
(3)(
3 |
16 |
1 |
24 |
2 |
3 |
(4)4-[3.75×(1.2-
1 |
3 |
3 |
4 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)运用乘法分配律计算;(2)先把除法化为乘法,再运用乘法分配律计算;(3)先运用乘法分配律,再运用加法结合律;(4)有括号先算小括号再算中括号,运用乘法分配律算小括号;
解答:
解:(1)
×0.25+
×
=
×(
+
)
=
×1
=
;
(2)
÷6+
×
=
×
+
×
=
×(
+
)
=
×
=
;
(3)(
+
)×8+
=
×8+
×8+
=
+
+
=
+(
+
)
=
+1
=
;
(4)4-[3.75×(1.2-
)+
]
=4-(3.75×1.2-3.75×
+
)
=4-(4.5-1.25+
)
=4-4
=0.
5 |
6 |
1 |
4 |
1 |
6 |
=
1 |
4 |
5 |
6 |
1 |
6 |
=
1 |
4 |
=
1 |
4 |
(2)
9 |
20 |
1 |
6 |
1 |
20 |
=
9 |
20 |
1 |
6 |
1 |
6 |
1 |
20 |
=
1 |
6 |
9 |
20 |
1 |
20 |
=
1 |
6 |
1 |
2 |
=
1 |
12 |
(3)(
3 |
16 |
1 |
24 |
2 |
3 |
=
3 |
16 |
1 |
24 |
2 |
3 |
=
3 |
2 |
1 |
3 |
2 |
3 |
=
3 |
2 |
1 |
3 |
2 |
3 |
=
3 |
2 |
=
5 |
2 |
(4)4-[3.75×(1.2-
1 |
3 |
3 |
4 |
=4-(3.75×1.2-3.75×
1 |
3 |
3 |
4 |
=4-(4.5-1.25+
3 |
4 |
=4-4
=0.
点评:完成本题要注意按运算顺计算,分析式中数据,并运用合适的简便方法计算.
练习册系列答案
相关题目