Por favor e pra amanhã determine o valor numérico destas expressões algébricas ,quando ele existir:( por favor façam as contas) a)3x -4   ,  em  x =64                                                                          
 
b)-2 x + y  , em que x= y =10
 2√x

c)X² -25 , em que x = 10
(x + 5) · (x - 5)
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