计算(1)(-10)+(+6)=-(10-6)=-4(2)(+12)+(-4)=+(12-4)=8(3)(-5)+(-7

计算
(1)
(-10)+(+6)
=-(10-6)
=-4
(2)
(+12)+(-4)
=+(12-4)
=8
(3)
(-5)+(-7)
=-(5+7)
=-12
(4)
(+6)+(-9)
=-(9-6)
=-3
(5)
(-0.9)+(-2.7)
=-(0.9+2.7)
=-3.6
(6)
5/2+(-5/3)
=-(5/3-5/2)
=-5/1
(7)
(-3/1)+5/2
=(-15/5)+15/6
=+(15/6-15/5)
=15/1
(8)
(3又4/1)+(-1又12/1)
=(3又12/31)+(-1又12/3)
=-4又12/4
大家说我做的对么!