问题
解答题
请你计算(要注意符号和检查) (1)(-53)+(+21)-(-69)-(+37) (2)-
(3)[(-7)-(-10)]-(-8) (4)-0.5+(-15
(5)(-3)×(-
|
答案
(1)(-53)+(+21)-(-69)-(+37)=-53+21+69-37=0;
(2)-
+7 12
-6 11
+5 12
=-5 11
-7 12
+5 12
+6 11
=0;5 11
(3)[(-7)-(-10)]-(-8)=3-(-8)=11;
(4)-0.5+(-15
)-(-17.5)-|-121 3
|=-0.5+17.5-152 3
-121 3
=17-28=-11;2 3
(5)(-3)×(-
)×(-7 5
)×1 3
=-4 7
×7 5
=-4 7
.4 5