Bài 1 Tìm xa) \(\frac{1}{4}\) x \(\frac{2}{6}\) x \(\frac{3}{5}\) x \(\frac{14}{10}\)x .......x \(\frac{30}{62}\) x \(\frac{31}{64}\)= 2xb) \(\frac{4^5+4^5+4^5+4^5}{3^5+3^5+3^5}\) + \(\frac{6^5+6^5+6^5+6^5+6^5+6^5}{2^5+2^5}\)= 2xc)\(\left(\frac{1}{2}\right)^x\) + \(\left(\frac{1}{2}\right)^{x+4}\) = 17d) 2x + 2x+1 + 2x+2 + 2x+3 =...
Đọc tiếp
Bài 1 Tìm x
a) \(\frac{1}{4}\) x \(\frac{2}{6}\) x \(\frac{3}{5}\) x \(\frac{14}{10}\)x .......x \(\frac{30}{62}\) x \(\frac{31}{64}\)= 2x
b) \(\frac{4^5+4^5+4^5+4^5}{3^5+3^5+3^5}\) + \(\frac{6^5+6^5+6^5+6^5+6^5+6^5}{2^5+2^5}\)= 2x
c)\(\left(\frac{1}{2}\right)^x\) + \(\left(\frac{1}{2}\right)^{x+4}\) = 17
d) 2x + 2x+1 + 2x+2 + 2x+3 = 120
thích làm mỗi câu d) mấy câu kia nhìn đã ớn rùi mà k thể hiện tư duy
d) = 2x + 2x.2 + 2x.22 + 2x.23 =120
2x( 1+2+4+8) =120
2x = 120/15 =8 =23
x =3
a);b) dài lắm ,mk làm c) giúp bn thui, mk còn phải học bài
c) = (1/2)x + (1/2)x. (1/2)4 = 17
(1/2)x(1 + 1/16) =17
(1/2)x = 1/16 = (1/2)4
x = 4