问题
解答题
计算 (1)-1+4-2 (2)-12×(1
(3)
(4)-14÷(-5)2×(-
|
答案
(1)-1+4-2
=3-2
=1.
(2)-12×(1
-1 3
+3 4
)5 6
=-16+9-10
=-17;
(3)
+3 -8
+(-2)64 81
=-2+
-2 8 9
=-
;28 9
(4)-14÷(-5)2×(-
)+|0.8-1|5 3
=-1÷25×(-
)+0.2 5 3
=
.4 15