a) ( x - 2/9 )³ = ( 2/3 ) ⁶

=>  ( x - 2/9 )³ = (4/9 )³

=> x - 2/9 = 4/9

=> x = 4/9 - 2/9

=> x = 2/9

x+15+3=56

x=56-3-15

x=38           k nha

Đặt A=2¹⁰+1

Ta có: A=2⁴⁺⁴⁺²+1

=> A=2⁴.2⁴.2²+1

=> A=(....1).(....1).(.......4)+1

=> A=(......4)+1

=> A=......5

119 k mk nha

19 con

130005
 

x=1/6suy ra A1/2^4 vay x bang 4 hoac -4

lon roi 

-4 moi dung 

xem cai tren roi them cai duoi nua nhe

xét a-b=2(a+b)

a-b=2a+2b

a-2a=2b+b

-a=3b => a=-3b(1)

xét 2(a+b)=a/b(2)

Từ (1);(2) => 2(-3b+b)=-3b/b

2*(-2)b=-3

-4b=-3

b=3/4

=>a=-3*3/4=-9/4

Vậy a=-9/4; b=3/4