计算(1)(-12)-(-314)+(+234)-(+512).(2)(-6)÷(-0.25)×1124.(3)-2+(1-0.2÷35)×(-3).(4)-1

计算(1)(-12)-(-314)+(+234)-(+512).(2)(-6)÷(-0.25)×1124.(3)-2+(1-0.2÷35)×(-3).(4)-1

题型:解答题难度:一般来源:不详
计算(1)(-
1
2
)-(-3
1
4
)+(+2
3
4
)-(+5
1
2
)

(2)(-6)÷(-0.25)×
11
24

(3)-2+(1-0.2÷
3
5
)×(-3)

(4)-14-
1
6
×[2-(-3)2]
答案
(1)(-
1
2
)-(-3
1
4
)+(+2
3
4
)-(+5
1
2
)

=(-
1
2
)+3
1
4
+2
3
4
+(-5
1
2
)

=[(-
1
2
)+(-5
1
2
)]+(3
1
4
+2
3
4

=(-6)+6
=0; 

(2)(-6)÷(-0.25)×
11
24

=(-6)×(-4)×
11
24

=24×
11
24

=11;

(3)-2+(1-0.2÷
3
5
)×(-3)

=-2+(1-
1
5
×
5
3
)×(-3)
=-2+
2
3
×(-3)
=-2+(-2)
=-4;

(4)-14-
1
6
×[2-(-3)2]
=-1-
1
6
×[2+(-9)]
=-1-
1
6
×(-7)
=-1+
7
6

=
1
6
举一反三
下列计算正确的是(  )
A.2÷(-
1
3
)=2×(-3)
B.-1
1
2
-
1
2
=-1
C.(-1)×(-2)=-2D.-1+2=-3
题型:单选题难度:简单| 查看答案
计算下列各题
(1)(5-6)-(7-9);            (2)(-4
1
4
)-(+5
1
3
)-(-4
1
4
)

(3)22+(-4)+(-2)+4;         (4)(-8)+(+0.25)-(-9)+(-
1
4

(5)(-81)÷2
1
4
;               (6)(-3)×
5
6
×(-
4
5
)×(-
1
4
)

(7)(1-
1
6
+
3
4
)×(-48);        (8)-1
1
2
÷
3
4
×(-0.2)×(-
5
2
题型:解答题难度:一般| 查看答案
计算
①23+(-37)-23+7               
②(
2
3
-
1
4
-
3
8
)×(-24)
③-22-(-3)2×(-1)3
④4×(-8)×25×(-1.25)
⑤4-[(-5-3)÷23]+32÷(-2)3
题型:解答题难度:一般| 查看答案
小明做了以下4道计算题:①(-1)2008=2008;②0-(-1)=1;③-
1
2
+
1
3
=-
1
6
;④
1
2
÷(-
1
2
)=-1
.请你帮他检查一下,他一共做对了(  )
A.1题B.2题C.3题D.4题
题型:单选题难度:一般| 查看答案
计算:(-3)2-34+4÷
4
9
×(-9)
题型:解答题难度:一般| 查看答案
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