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Tim x biet : 20 . 2^x + 1 = 10.4^2 + 1
Tim x : ( 4-x:2)^3 - 1 = 2 . (2^3 - 5 : 2^0 )
tim x biet 1/4 - (2 . x 1/2)^2 = 0
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tim x biet x+34 la boi cua x+1 tim x biet 2x+1 la uoc cua x+82
tim x biet 1/2(x-2/3)-1/3(2x-3)=x+1/2
tim x biet x+10 la boi cua x+1
tim x biet 2x+1 la uoc cua x+82
a, Tim so tu nhien x, y biet rang 4<9/x<12/y<18
b, Tim so nguyen x, y biet rang x/2 - 2/y = 1/2
tim x biet 1/x+1/y+1/xy=1/2
tim x biet x(x-1)=0
(x-1).(x+2)=0
tim x biet: (x+1)+(x-3)=x-2