题目内容

(1)(-2)-(-5)+(-9)-(-7)
(2)18-6÷(-2)×(-
1
3
)

(3)(-
3
4
)×(-8+
2
3
-
1
3
)

(4)-11-2×(-33)+(-22)
(1)原式=-2+5-9+7
=-11+12
=1;

(2)原式=18-6×(-
1
2
)×(-
1
3

=18-1
=17;

(3)原式=-
3
4
×(-8)-
3
4
×
2
3
-
3
4
×(-
1
3

=6-
1
2
+
1
4
=6-
1
4

=5
3
4


(4)原式=-11+66-22
=66-33
=33.
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