问题
解答题
计算: (1)(-1.2)+[1-(-0.3)]; (2)(-0.5)-(-3
|
答案
(1)(-1.2)+[1-(-0.3)]=-1.2+1+0.3=0.1;
(2)(-0.5)-(-3
)+2.75-(+71 4
)=-0.5+31 2
+2.75-71 4
=-8+6=-2.1 2
计算: (1)(-1.2)+[1-(-0.3)]; (2)(-0.5)-(-3
|
(1)(-1.2)+[1-(-0.3)]=-1.2+1+0.3=0.1;
(2)(-0.5)-(-3
)+2.75-(+71 4
)=-0.5+31 2
+2.75-71 4
=-8+6=-2.1 2