题目内容
请你在四个“”中间加上+、-、×、÷、( )以后,使之组成结果分别等于0、1、2、3、4的五个等式.
(1)
=0.
(2)
=1
(3)
=2
(4)
=3
(5)
=4.
(1)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
(2)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
(3)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
(4)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
(5)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
分析:结合数字特点可得:(1)
+
-
-
=0;
(2)
÷
=1,1÷
=2,2×
=1,据此即可解答;
(3)
÷
=1,
÷
=1,1+1=2,据此即可解答;
(4)
+
+
=
,
÷
=3,据此即可解答;
(5)
÷
=1,1÷
=2,2÷
=4,据此即可解答;
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
(2)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
(3)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
(4)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 1 |
| 2 |
(5)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
解答:解:(1)
+
-
-
=0;
(2)
÷
÷
×
=1;
(3)
÷
+
÷
=1+1
=2;
(4)(
+
+
)÷
=
÷
=3;
(5)
÷
÷
÷
=4.
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
(2)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
(3)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
=1+1
=2;
(4)(
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
=
| 3 |
| 2 |
| 1 |
| 2 |
=3;
(5)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
点评:这种题没有规律,只能思维灵活地根据数字特点,恰当加上运算符号和括号使等式成立.
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