8.2+1.8÷2.5-1.5×0.6 怎样简算,4又6分之一减x等于2又5分之3怎样解方程!急,

问题描述:

8.2+1.8÷2.5-1.5×0.6 怎样简算,4又6分之一减x等于2又5分之3怎样解方程!急,
求你们了,不然明天我不教,会被骂的

=8.2+1.8*0.4-1.5*0.6=8.2+1.8*0.4-1.5*(0.4+0.2)=8.2+1.8*0.4-1.5*0.4-1.5*0.2=8.2+(1.8-1.5)*0.4-1.5*0.2=8.2+0.3*0.4-1.5*0.2=8.2+0.3*2*0.2-1.5*0.2=8.2+0.6*0.2-1.5*0.2=8.2-(1.5-0.6)*0.2=8.2-0.9*0.2==...