问题 解答题
计算:
①-
7
5
+(+
1
10
)              
②90-(-3)
③-0.5-(-3
1
4
)+2.75-(+7
1
2
)   
(-4
7
9
)-(-3
1
6
)-(+2
2
9
)+(-6
1
6
)
答案

①-

7
5
+(+
1
10
)=-1.3;              

②90-(-3)=93;

③-0.5-(-3

1
4
)+2.75-(+7
1
2
)   

=(-0.5-7.5)+(3

1
4
+2.75)

=-8+6

=-2;

(-4

7
9
)-(-3
1
6
)-(+2
2
9
)+(-6
1
6
)

=(-4

7
9
-2
2
9
)+(3
1
6
-6
1
6

=-7-3

=-10.

单项选择题
单项选择题