问题
解答题
计算: (1)-165+265-78-22+65; (2)(-
(3)-42-12×(
(4)3-(-2)×(-1)-8÷(-
|
答案
(1)原式=-100+265-100
=-200+265
=65;
(2)原式=-
+21 2
+21 3
-3 4
-37 8 2 3
=-
-11 2
+21 3
-3 4 7 8
=1-
-20 24 3 24
=
;1 24
(3)原式=-16-12×(-
)÷(-12 3
)1 3
=-16+8÷(-1
)1 3
=-16-6
=-22;
(4)原式=3-2-8÷
×21 4
=1-64
=-63.