2/(11x13) = 1/11 - 1/13 ; 2/(13x15) = 1/13 - 1/15 ; 2/(15x17) = 1/15 - 1/17 ; 2/(17x19) = 1/17 - 1/19 ; 2/(19x21) = 1/19 - 1/21
2/(11x13) + 2/(13x15) + 2/(15x17) + 2/(17x19) 2/(19x21) =
1/11 - 1/13 + 1/13 - 1/15 + 1/15 - 1/17 + 1/17 - 1/19 + 1/19 - 1/21 = 1/11 - 1/21 = 101231
Hay: 10/231 x 462 - X = 19
20 - X = 19
X = 20 - 19
X = 1
(2/11x13 +2/13x15 +...+2/19x21)x426-(2,04:(x+1,05)):0,12=19
tìm x hộ mình nhé
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 y biết: \(\left(\frac{2}{11x13}+\frac{2}{13x15}+\frac{2}{15x17}+\frac{2}{17x19}+\frac{2}{19x21}\right)x462-y=19\)
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-(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 )
bài 1 tìm x biết a) 0,25x.(8/5:1+1/2+1/50)=7/50.(2,91+0,09).4
b)(2/11.13+2/13.15+...+2/19.21).462-[0,04:(x+1,05):0,12=19
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