试题:
细心算一算
(1)(+2)-(-6)
(2)|-3|×(-
3
4
)÷(-
1
4

(3)(
1
2
-
5
6
-
3
5
)×30

(4)18-[6-(-2)×(-
1
2
)]

(5)-21
2
3
+(+3
1
4
)-(-
2
3
)-(+
1
4
)

(6)(
5
9
-
7
6
)×(-18)-16×(
2
9
-
7
18
)

答案:

我来补答
(1)(+2)-(-6)=8;

(2)|-3|×(-
3
4
)÷(-
1
4

=3×
3
4
×4
=9;

(3)(
1
2
-
5
6
-
3
5
)×30

=
1
2
×30-
5
6
×30-
3
5
×30
=15-25-18
=-28;

(4)18-[6-(-2)×(-
1
2
)]

=18-[6-1]
=18-5
=13;

(5)-21
2
3
+(+3
1
4
)-(-
2
3
)-(+
1
4
)

=-21
2
3
+
2
3
+3
1
4
-
1
4

=-21+3
=-18;

(6)(
5
9
-
7
6
)×(-18)-16×(
2
9
-
7
18
)

=-
11
18
×(-18)-16×(-
1
6

=11+2
2
3

=13
2
3
 
 
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