-7+(+7)-(-15)-1= -2.8-6.2+(-3.4)-(-5.6)= ()+ -3.6=0.36.这个数是.(-

问题描述:

-7+(+7)-(-15)-1= -2.8-6.2+(-3.4)-(-5.6)= ()+ -3.6=0.36.这个数是.(-
-7+(+7)-(-15)-1=
-2.8-6.2+(-3.4)-(-5.6)=
()+ -3.6=0.36.这个数是.
(-14)-(+5)=-9错哪里了.

-7+(+7)-(-15)-1=-7+7+15-1=22-8=14-2.8-6.2+(-3.4)-(-5.6)=-2.8-6.2-3.4+5.6=5.6-(2.8+6.2+3.4)=5.6-12.4=-6.8()+ -3.6=0.36.这个数是.0.36-(-3.6)=0.36+3.6=3.96答:这个数是3.96.(-14)-(+...