题目内容
计算
(1)5.425+4.575=
(2)67-48=
(3)36÷2=
(4)7.2÷0.04=
(5)6÷(
+
)=
(6)42×(
-
+
)=
(7)3
-(7
-5
)=
(8)7
+
-
+2.25=
(9)3÷
×
÷
=
(10)73×0.6+26×60%+
=
(1)5.425+4.575=
(2)67-48=
(3)36÷2=
(4)7.2÷0.04=
(5)6÷(
1 |
4 |
1 |
3 |
(6)42×(
1 |
2 |
1 |
6 |
1 |
3 |
(7)3
3 |
4 |
2 |
3 |
3 |
4 |
(8)7
5 |
7 |
3 |
4 |
19 |
7 |
(9)3÷
3 |
8 |
8 |
3 |
1 |
3 |
(10)73×0.6+26×60%+
3 |
5 |
分析:(1)(2)(3)(4)高年级运算法则求解;
(5)先算小括号里面的加法,再算括号外的除法;
(6)运用乘法分配律简算;
(7)先去括号,再运用加法交换律;
(8)运用加法交换律和加法结合律简算;
(9)先把除法变成乘法,再运用乘法结合律简算;
(10)运用乘法分配律简算.
(5)先算小括号里面的加法,再算括号外的除法;
(6)运用乘法分配律简算;
(7)先去括号,再运用加法交换律;
(8)运用加法交换律和加法结合律简算;
(9)先把除法变成乘法,再运用乘法结合律简算;
(10)运用乘法分配律简算.
解答:解:(1)5.425+4.575=10;
(2)67-48=19;
(3)36÷2=18;
(4)7.2÷0.04=180;
(5)6÷(
+
),
=6÷
,
=
;
(6)42×(
-
+
),
=42×
-42×
+42×
,
=21-7+14,
=28;
(7)3
-(7
-5
),
=3
+5
-7
,
=9
-7
,
=1
;
(8)7
+
-
+2.25,
=(7
-2
)+(
+2
),
=5+3,
=8;
(9)3÷
×
÷
,
=3×
×
×3,
=(3×
)×(
×3),
=8×8,
=64;
(10)73×0.6+26×60%+
,
=(73+26+1)×0.6,
=100×0.6,
=60.
(2)67-48=19;
(3)36÷2=18;
(4)7.2÷0.04=180;
(5)6÷(
1 |
4 |
1 |
3 |
=6÷
7 |
12 |
=
72 |
7 |
(6)42×(
1 |
2 |
1 |
6 |
1 |
3 |
=42×
1 |
2 |
1 |
6 |
1 |
3 |
=21-7+14,
=28;
(7)3
3 |
4 |
2 |
3 |
3 |
4 |
=3
3 |
4 |
3 |
4 |
2 |
3 |
=9
1 |
2 |
2 |
3 |
=1
5 |
6 |
(8)7
5 |
7 |
3 |
4 |
19 |
7 |
=(7
5 |
7 |
5 |
7 |
3 |
4 |
1 |
4 |
=5+3,
=8;
(9)3÷
3 |
8 |
8 |
3 |
1 |
3 |
=3×
8 |
3 |
8 |
3 |
=(3×
8 |
3 |
8 |
3 |
=8×8,
=64;
(10)73×0.6+26×60%+
3 |
5 |
=(73+26+1)×0.6,
=100×0.6,
=60.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
练习册系列答案
相关题目