7/5-(+2/5) -5/6-7/6 -7/5+0.4 -1/8+0.125
-0.375-(-0)
=7/5-2/5-(5/6+7/6)-(7/5-2/5)-(1/8-1/8)-3/8
=1-2-1-3/8
=-19/8
哦,我改一下
(1)7/5-(+2/5)=7/5-2/5=1
(2)-5/6-7/6=-12/6=-2
(3)-7/5+0.4=-7/5+2/5=-1
(4)-1/8+0.125=-1/8+1/8=0
(5)-0.375-(-0)=-3/8
我已经改过了
7/5-(+2/5) -5/6-7/6 -7/5+0.4 -1/8+0.125
-0.375-(-0)
=7/5-2/5-(5/6+7/6)-(7/5-2/5)-(1/8-1/8)-3/8
=1-2-1-3/8
=-19/8
哦,我改一下
(1)7/5-(+2/5)=7/5-2/5=1
(2)-5/6-7/6=-12/6=-2
(3)-7/5+0.4=-7/5+2/5=-1
(4)-1/8+0.125=-1/8+1/8=0
(5)-0.375-(-0)=-3/8
我已经改过了