问题 解答题
计算
(1)-20+(-14)-(-18)-13
(2)1-
4
7
+
1
5
-
3
7
+
9
5

(3)2
8
9
×(-36)
(用简便方法计算)
(4))10+(-2)2×(-5)
(5)(-25)÷
5
4
×
4
5
÷(-16)

(6)(-24)×(
1
6
-
1
4
+
1
2
答案

(1)-20+(-14)-(-18)-13

=-20-14+18-13

=-29;

(2)1-

4
7
+
1
5
-
3
7
+
9
5

=1-(

4
7
+
3
7
)+(
1
5
+
9
5

=1-1+2

=2;

(3)2

8
9
×(-36)

=(3-

1
9
)×(-36)

=3×(-36)-

1
9
×(-36)

=-108+4

=-104;

(4))10+(-2)2×(-5)

=10+4×(-5)

=10-20

=-10;

(5)(-25)÷

5
4
×
4
5
÷(-16)

=25×

4
5
×
4
5
×
1
16

=1;

(6)(-24)×(

1
6
-
1
4
+
1
2

=-24×

1
6
+24×
1
4
-24×
1
2

=-4+6-12

=-10.

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