问题 解答题
细心算一算
(1)11+(-22)-3×(-11);
(2)(-1
1
2
)×(-
3
4
)
÷(2
1
4
)

(3)(-2
1
2
+(+
5
6
)+(-0.5)+(+
1
6
)
;      
(4)(-5)×(-7)-5×(-6);
(5)-22×(-
1
2
)+8÷(-2)2
;                 
(6)-|5|+(-3)3÷(-22);
(7)(
5
12
+
2
3
-
3
4
)×24;             
(8)[(-3)2-(-5)2]÷(-2).
答案

(1)原式=11-22+33=-11+33=22;

(2)原式=-

3
2
×
3
4
×
4
9
=-
1
2

(3)原式=-2

1
2
+
5
6
-
1
2
+
1
6
=-2
1
2
-
1
2
+
5
6
+
1
6
=-3+1=-2;

(4)原式=35+30=65;

(5)原式=4×

1
2
+8÷4=2+2=4;

(6)原式=-5-27÷4=-5-

27
4
=-
47
4

(7)原式=

5
12
×24+
2
3
×24-
3
4
×24=10+16-18=-2;

(8)原式=(9-25)÷(-2)=-16÷(-2)=8.

选择题
单项选择题