anhne439
anhne439
22-07-2021
Mathematics
contestada
tìm x, y, z biết : 1. x/7=7/x 2.x-2/5=3/8
Respuesta :
datchivas
datchivas
22-07-2021
1. x.x=7.7 (nhân chéo)
<=>x^2 = 49
<=>x = 7
2. x= 31/40
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