Question

as vrea daca poate cineva sa verifice rezolvarea daca am facut ok

Answer 1

x + y = 54

y + z = 72

z + t = 91

_________

( x + y ) + ( y + z ) + ( z + t ) = 54 + 72 + 91

x + 2 y + 2 z + t = 217

x + t + 2 ( y + z ) = 217

x + t + 2 × 72 = 217

x + t = 217 - 144

x + t = 73

________

x + 3 y + 5 z + 3 t = 471

__________________

= x + 3 y + 3 z + 2 z + 2 t + t =

= x + 3 ( y + z ) + 2 ( z + t ) + t =

= ( x + t ) + 3 × 72 + 2 × 91 =

= 73 + 216 + 182 =

= 471

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471 : 73 = 6 rest 33