dividing two measures

Khaoula_Farissi , You can have measures like

M1 = divide(countrows(Table),calculate(countrows(Table), allexpect(Table, Table[wave])))

M2 = divide(countrows(Table),calculate(countrows(Table), allexpect(Table, Table[BrandM1])))

M3 = divide(countrows(Table),calculate(countrows(Table), allexpect(Table, Table[BrandM2])))

last table

measure 1 =
var M1 = divide(countrows(Table),calculate(countrows(Table), allexpect(Table, Table[wave])))
var M2 = divide(countrows(Table),calculate(countrows(Table), allexpect(Table, Table[BrandM1])))
return
divide(M1,M2)

i apperciate your help amitchandak 

but i didn't get the correct result

Khaoula_Farissi , You want to use M1 and M2 in same row, that is bit different. I create a file, Check that. You need check you second martix is grouping M2 or Using M2 in formula but grouping M1, based on that you have to change formula.

Please find the file attached after signature.