b, (2 / 11x13+2 / 13x15+...........+ 2 / 19x21)x462-[0,04;(x+1,05)] : 0,12 = 19
(2/11x13 + 2/13x15 + ....... + 2/19x21) x 462 - 2,04 : ( x + 1,5 ) +11,02 = 30 tìm X
AI GIÚP MÌNH BÀI NÀY NHANH NHẤT MÌNH TICK CHO ( GIẢI CHI TIẾT NHA )
a,tìm x: 60% x + 2/3x=-76
b,tìm x (2/11x13 +2 /13x15 +...+ 2/19x21 ).492 - [0,04 :(x+1.05)]:0,12=19
Tìm x biết [11/12+11/12x13+11/23x24+...+11/89/100]+ x= 2/3,phần b :[2/11x13+2/13x15+...+2/19x21]+ x +221/231=4/3
(\(\frac{2}{11x13}\)+\(\frac{2}{13x15}\)+\(\frac{2}{15x17}\)+\(\frac{2}{17x19}\)+\(\frac{2}{19x21}\)) x 462 - x = 19
(2/11.13+2/13.15+.......+2/19.21).462 -{2,04:(x+1,05):0,12=19
Tim x
(2/11.13+2/13.15+...+2/19.21).462-[2,04:(x+1,05)]:0,12=19
tìm y biết: \(\left(\frac{2}{11x13}+\frac{2}{13x15}+\frac{2}{15x17}+\frac{2}{17x19}+\frac{2}{19x21}\right)x462-y=19\)
8) 20 - [2,04 : (x + 1,05)] : 0,12 = 11,5.
9) (y + 1) + (y + 2) + (y + 3) + ……….+ (y + 50) = 685.
