问题
解答题
计算 (1)(-12)-(-
(2)1-42÷5×(-
(3)(
(4)-14÷(-5)2×(-
|
答案
(1)原式=-12+
-8-6 5 4 5
=-20+2 5
=-19
;3 5
(2)原式=1+16÷5×1 5
=1+16 25
=
;41 25
(3)原式=-
×60+2 3
×60+1 12
×604 15
=-40+5+16
=-19;
(4)原式=-1÷25×(-
)+0.1-15 3
=1×
×1 25
+0.1-15 3
=
+1 15
-11 10
=-
.5 6