题目内容
在下面各题中,请你用给出的四个数,适当进行加、减、乘、除运算,每个数恰好用一次,使得计算结果等于24.
(1)1,4,5,6;
(2)1,5,5,5;
(3)3,3,7,7;
(4)3,3,8,8.
(1)1,4,5,6;
(2)1,5,5,5;
(3)3,3,7,7;
(4)3,3,8,8.
考点:填符号组算式
专题:填运算符号、字母等的竖式与横式问题
分析:(1)因为5÷6=
,1-
,1÷
=24;据此解答;
(2)1÷5=
,5-
=
,5×
=24;据此解答;
(3)3÷7=
,3+
=
,7×
=24;据此解答;
(4)8÷3=
,3-
=
,8÷
=24;据此解答即可.
5 |
6 |
5 |
6 |
1 |
6 |
(2)1÷5=
1 |
5 |
1 |
5 |
24 |
5 |
24 |
5 |
(3)3÷7=
3 |
7 |
3 |
7 |
24 |
7 |
24 |
7 |
(4)8÷3=
8 |
3 |
8 |
3 |
1 |
3 |
1 |
3 |
解答:
解:(1)4÷(1-5÷6)
=4÷
=24
(2)5×(5-1÷5)
=5×
=24
(3)7×(3+3÷7)
=7×
=24
(4)8÷(3-8÷3)
=8÷
=24.
=4÷
1 |
6 |
=24
(2)5×(5-1÷5)
=5×
24 |
5 |
=24
(3)7×(3+3÷7)
=7×
24 |
7 |
=24
(4)8÷(3-8÷3)
=8÷
1 |
3 |
=24.
点评:利用加减乘除法的意义,合理的运用四则混合运算的顺序即可解决问题.
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