Toán Lớp 6: tìm x (14 – 2x)³ . 2 + 100= 2² . 29

Question

Toán Lớp 6:  tìm x  (14 – 2x)³ . 2 + 100= 2² . 29

minhtuyethue · Answer

Giải đáp:      (14 &ndash; 2x)^3. 2 + 100=2^2 . 29     =>(14 &ndash; 2x)^3. 2 + 100=116     =>(14 &ndash; 2x)^3. 2=116-100     =>(14 &ndash; 2x)^3.2=16     =>(13-2x)^3=16:2     =>(13-2x)^3=8     =>(13-2x)^3=2^3     =>14-2x=2     =>     2x=14-2     =>    2x=12     =>     x=12:2     =>     x=6     Vậy x=6

quynhmaithu · Answer

(14 &ndash; 2x)&sup3; . 2 + 100= 2&sup2; . 29   (14 &ndash; 2x)&sup3; . 2 + 100= 116   (14 &ndash; 2x)&sup3; . 2          = 116 -100   (14 &ndash; 2x)&sup3; . 2          = 16   (14 &ndash; 2x)&sup3;               = 16 : 2   (14 &ndash; 2x)&sup3;               = 8   (14 &ndash; 2x)&sup3;               = 2&sup3;   14 _ 2x                 = 2           2x                = 14 - 2           2x               = 12             x                = 12 : 2             x                = 6   Vậy x = 6