125.5x + 5x+1 = 3250
125.5x + 5x.51 = 3250
5x(125 + 51) = 3250
5x.130 = 3250
5x = 3250 : 130
5x = 25
5x = 52
=> x = 2
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125.5x + 5x+1 = 3250
125.5x + 5x.51 = 3250
5x(125 + 51) = 3250
5x.130 = 3250
5x = 3250 : 130
5x = 25
5x = 52
=> x = 2
125.5^x+5^x+1 =3250
tim x:
5^x+5^x-2=3250
tim x
5^2x-1 = 125.5^4
7^x-3.4=196
2^x.2^x+3=64^2:2^5
a, tim x€Z biet (x-6) chia het cho (x-5)
b, tim x€Z, y€Z biet (x-1).(xy-5)=5
tim x biet x/4 = 5/x+1
5^x+5^x+2=3250 ?
tim x biet,(1+5+5^2+...+5^2011)|x-1|=5^2012-1
tim so nguyen x ,biet (x+1)(xy-5)=5
tim x biet (x+1)+(x+5)+(x+2)=5x