题目内容
将“+、-、×、÷”填入适当的地方,使下面的等式成立.
(1)4
(2)4
(3)4
(4)4
(5)4
(6)4
(1)4
÷
÷
4-(
-(
4-
-
4)×
)×
4=1 (2)4
×(
×(
4+
+
4)÷
)÷
4÷
÷
4=2(3)4
÷
÷
4+(
+(
4-
-
4)×
)×
4=1 (4)4
-
-
4÷
÷
4-
-
4÷
÷
4=2(5)4
+
+
4÷
÷
4-
-
4÷
÷
4=4 (6)4
+(
+(
4-
-
4)+
)+
4÷
÷
4=5.分析:(1)先计算4-4=0,再算0×4=0,4÷4=1,1-0=1;据此即可填空;
(2)先计算4+4=8,再算4×8=32,32÷4=8,8÷4=2;据此即可填空;
(3)先计算4-4=0,再算4÷4=1,0×4=0,1+0=1;据此即可填空;
(4)先计算4÷4=1,再算4÷4=1,4-1=3,3-1=2;据此即可填空;
(5)先计算4÷4=1,再算4÷4=1,4+1=5,5-1=4;据此即可填空;
(6)先计算4-4=0,再算4÷4=1,4+0=4,4+1=5;据此即可填空.
(2)先计算4+4=8,再算4×8=32,32÷4=8,8÷4=2;据此即可填空;
(3)先计算4-4=0,再算4÷4=1,0×4=0,1+0=1;据此即可填空;
(4)先计算4÷4=1,再算4÷4=1,4-1=3,3-1=2;据此即可填空;
(5)先计算4÷4=1,再算4÷4=1,4+1=5,5-1=4;据此即可填空;
(6)先计算4-4=0,再算4÷4=1,4+0=4,4+1=5;据此即可填空.
解答:解:(1)4÷4-(4-4)×4,
=1-0,
=1;
(2)4×(4+4)÷4÷4,
=32÷4÷4,
=2;
(3)4÷4+(4-4)×4,
=1+0,
=1;
(4)4-4÷4-4÷4,
=4-1-1,
=2;
(5)4+4÷4-4÷4,
=4+1-1,
=4;
(6)4+(4-4)+4÷4,
=4+0+1,
=5.
=1-0,
=1;
(2)4×(4+4)÷4÷4,
=32÷4÷4,
=2;
(3)4÷4+(4-4)×4,
=1+0,
=1;
(4)4-4÷4-4÷4,
=4-1-1,
=2;
(5)4+4÷4-4÷4,
=4+1-1,
=4;
(6)4+(4-4)+4÷4,
=4+0+1,
=5.
点评:观察题干,数字特点联系结果综合分析,然后加入适当的运算符号,使等式成立,同时注意答案的不唯一.
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