问题
解答题
计算: (1)(+2)+(-11); (2)(+20)+(+12); (3)(-1
(4)(-3.4)+4.3. |
答案
(1)(+2)+(-11)=2-11=-9;
(2)(+20)+(+12)=20+12=32;
(3)(-1
)+(-1 2
)=-12 3
-1 2
=-22 3
;1 6
(4)(-3.4)+4.3=-3.4+4.3=0.9.
计算: (1)(+2)+(-11); (2)(+20)+(+12); (3)(-1
(4)(-3.4)+4.3. |
(1)(+2)+(-11)=2-11=-9;
(2)(+20)+(+12)=20+12=32;
(3)(-1
)+(-1 2
)=-12 3
-1 2
=-22 3
;1 6
(4)(-3.4)+4.3=-3.4+4.3=0.9.