1-1/2+1/3-1/4+...+1/121-1/122+1/123=1/62+1/63+...+1/122+1/123
1-1/2+1/3-1/4+...+1/121-1/122+1/123=1/62+1/63+...+1/122+1/123
1-1/2+1/3-1/4+...+1/121-1/122+1/123=1/62+1/63+...+1/122+1/123
Tìm x: \(\frac{x-1}{117}+\frac{x-2}{118}+\frac{x-3}{119}=\frac{x-4}{120}+\frac{x-5}{121}+\frac{x-6}{122}\)
Chứng minh rằng
\(1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+..+\frac{1}{121}-\frac{1}{122}+\frac{1}{123}=\frac{1}{62}+\frac{1}{63}+...+\frac{1}{122}\)-\(\frac{1}{123}\)
B1:Viết dưới dạng 1 lũy thừa:
a)a4.a5:a3
b)m6.m.m7:m3
c)100.10000000:1000
d)132-122
B2:tìm x biết:
a)3(24-x2)-10=14
b)(x-2)3+23=62-1
c)2x+2x+3=72
TÌM X MỘT CÁCH NHANH NHẤT .
X = { 16 14 . 12 . 10 .......... 2 + [ 2-2 . 121(15 . 13 . 11 ........ 3)] . 7 + 7 . 7 + 7 . 7 + 7}Tìm x:
a) x 8 = − 1 4
b) 6 x − 3 = 9 2 x − 7
c) x − 1 2 2 = 4
Tìm x ϵ N biết:b) 35 - 5 (x - 1) = 10 c) 24. (x - 16) = 122 d) (x2 - 10) : 5 = 3