题目内容

计算:
(1)(+26)+(-18)+5-16
(2)(-81)÷
9
4
×
4
9
÷(-16)

(3)7+5×(-2)-(-3)3÷9
(4)-12×(
2
3
+
1
4
-
5
6
)
(1)(+26)+(-18)+5-16
=26-18+5-16
=31-34
=-3;

(2)(-81)÷
9
4
×
4
9
÷(-16)
=(-81)×
4
9
×
4
9
×(-
1
16

=1;

(3)7+5×(-2)-(-3)3÷9
=7+(-10)-(-27)÷9
=-3-(-3)
=0;

(4)-12×(
2
3
+
1
4
-
5
6

=-(12×
2
3
+12×
1
4
-12×
5
6

=-(8+3-10)
=-1.
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