问题 解答题
计算
(1)(-7)-9-(-3)+(-5);
(2)(-
1
3
)+(+
2
5
)+(+
3
5
)+(-1
2
3
);
(3)-24×(-
1
2
+
3
4
-
1
3
);
(4)(-2)÷
1
3
×(-3);
(5)-14+8÷(-2)2-(-4)×(-3);
(6)-19
8
9
×3.(用简便计算)
答案

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

=-7-9+3-5

=-21+3

=-18;

(2)(-

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

=(-

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

=-2+1

=-1;

(3)-24×(-

1
2
+
3
4
-
1
3

=24×

1
2
-24×
3
4
+24×
1
3

=12-18+8

=2;

(4)(-2)÷

1
3
×(-3)

=-6×(-3)

=18;

(5)-14+8÷(-2)2-(-4)×(-3)

=-1+8÷4-12

=-1+2-12

=-11;

(6)-19

8
9
×3

=(-20+

1
9
)×3

=-20×3+

1
9
×3

=-60+

1
3

=-59

2
3

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