计算题(1)23-17-(-7)+(-16)(2) -3÷(-5)× 1 5 (3) ( 2 3 - 11 12

2025-06-29 10:37:04
推荐回答(1个)
回答1:

(1)原式=23-17+7+(-16)
=13+(-16)
=-3;
 
(2)原式=-3×(-
1
5
)×
1
5

=
3
25


(3)原式=
2
3
×(-60)-
11
12
×(-60)-
14
15
×(-60)
=-40+55+56
=61;

(4)原式=1-
1
6
×(3-9)
=1-
1
6
×(-6)
=1+1
=2.