题目内容

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)
(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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