题目内容
脱式计算.
(1)45×(67+43) | (2)3.68÷4.6+6.32 | (3)
| ||||||||||||
(4)1.8×(4.7-3.87÷0.9) | (5)
|
(6)36÷[(
|
考点:分数的四则混合运算,整数四则混合运算,小数四则混合运算
专题:运算顺序及法则
分析:(1)先算小括号里面的加法,再算括号外的乘法;
(2)先算除法,再算加法;
(3)先把除法变成乘法,再约分求解;
(4)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的乘法;
(5)先算小括号里面的乘法,再运用加法交换律和结合律简算;
(6)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法.
(2)先算除法,再算加法;
(3)先把除法变成乘法,再约分求解;
(4)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的乘法;
(5)先算小括号里面的乘法,再运用加法交换律和结合律简算;
(6)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法.
解答:
解:(1)45×(67+43)
=45×110
=4950;
(2)3.68÷4.6+6.32
=0.8+6.32
=7.12;
(3)
÷
×
=
×
×
=
;
(4)1.8×(4.7-3.87÷0.9)
=1.8×(4.7-4.3)
=1.8×0.4
=0.72;
(5)
+(
-
×
)
=
+(
-
)
=
-
+
=
;
(6)36÷[(
-
)×3]
=36÷[
×3]
=36÷
=24.
=45×110
=4950;
(2)3.68÷4.6+6.32
=0.8+6.32
=7.12;
(3)
7 |
2 |
5 |
9 |
5 |
14 |
=
7 |
2 |
9 |
5 |
5 |
14 |
=
9 |
4 |
(4)1.8×(4.7-3.87÷0.9)
=1.8×(4.7-4.3)
=1.8×0.4
=0.72;
(5)
1 |
5 |
1 |
4 |
3 |
10 |
2 |
3 |
=
1 |
5 |
1 |
4 |
1 |
5 |
=
1 |
5 |
1 |
5 |
1 |
4 |
=
1 |
4 |
(6)36÷[(
5 |
6 |
1 |
3 |
=36÷[
1 |
2 |
=36÷
3 |
2 |
=24.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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