问题 解答题
计算:
(1)-20+(-14)-(-18)+13;
(2)
7
4
÷(-
7
8
)-
2
3
×(-6)

(3)(-
3
4
-
7
6
+
11
12
)÷(-
1
24
)

(4)-22+(-2)2-|-
1
4
|×(-10)2
答案

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

=-20-14+18+13

=-34+31

=-3;

(2)

7
4
÷(-
7
8
)-
2
3
×(-6)

=-2-(-4)

=2;

(3)(-

3
4
-
7
6
+
11
12
)÷(-
1
24
)

=(-

3
4
-
7
6
+
11
12
)×(-24)

=

3
4
×24+
7
6
×24-
11
12
×24

=18+28-22

=24;

(4)-22+(-2)2-|-

1
4
|×(-10)2

=-4+4-

1
4
×100

=-4+4-25

=-25.

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