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Giúp mình với:\(\dfrac{x}{2008}-\dfrac{1}{10}-\dfrac{1}{15}-\dfrac{1}{21}-....-\dfrac{1}{120}=\dfrac{5}{8}\)
Tìm x,y,z,t thuộc Z , biết
a) x/42=(-120)/y=45/z-1=135/Giá trị tuyệt đối của t-1=15/21
b)x/(-10)=-y-1/15=4/5
NT
28 tháng 6 2016 lúc 15:41
1+2-3-4+5-6-7-8+9+10-...+2006-2007-2008+2009
Tính:
a. [-2008 . 57 + 1004 . (-86)] . [32 . 75 + 16 . 5 - 48]
b. 1/24 + 1/12 + 1/8 + 1/2
c.. 1+2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - ... + 2006 - 2007 - 2008 + 2009
M.n vào giúp mk nha!!! Mk đang cần gấp lắm đó!!!
-5/8=x/16
Y/10=(-4)/8
Bai 8:
1) x/3-1/4=(-5)/6
2) x+3/15=1/3
3) x-12/4=1/2
4) 3/4x=1/2
y = 1/10 + 1/15 + 1/21 + ... + 1/120
1,Tính
A,15/16.4/3-1/2÷5/4+3
B,(2/3-3/8)÷(3/5+1/4)
C,15/8×(1/3+1/8)-3/8÷3/4
D,20/21÷(4/5-1/10)+13/15÷5/26
Tính nhanh theo mẫu:
Mẫu: Bleft(1+dfrac{1}{3}right)x left(1+dfrac{1}{8}right)x left(1+dfrac{1}{15}right)x left(1+dfrac{1}{24}right)x ..... x left(1+dfrac{1}{120}right)x left(1+dfrac{1}{413}right)
Bleft(dfrac{3}{3}+dfrac{1}{3}right)x left(dfrac{8}{8}+dfrac{1}{8}right)x left(dfrac{15}{15}+dfrac{1}{15}right)x left(dfrac{24}{24}+dfrac{1}{24}right)x........xleft(dfrac{120}{120}+dfrac{1}{120}right)x left(dfrac{143}{143}+dfrac{1}{143}right)
Bdfrac{4}{3}xdfrac{9}{8}xdfrac{16}{15}xdfrac{25}{24}x.........
Đọc tiếp
Tính nhanh theo mẫu:
Mẫu: \(B=\left(1+\dfrac{1}{3}\right)\)x \(\left(1+\dfrac{1}{8}\right)\)x \(\left(1+\dfrac{1}{15}\right)\)x \(\left(1+\dfrac{1}{24}\right)\)x ..... x \(\left(1+\dfrac{1}{120}\right)\)x \(\left(1+\dfrac{1}{413}\right)\)
\(B=\left(\dfrac{3}{3}+\dfrac{1}{3}\right)\)x \(\left(\dfrac{8}{8}+\dfrac{1}{8}\right)\)x \(\left(\dfrac{15}{15}+\dfrac{1}{15}\right)\)x \(\left(\dfrac{24}{24}+\dfrac{1}{24}\right)\)x........x\(\left(\dfrac{120}{120}+\dfrac{1}{120}\right)\)x \(\left(\dfrac{143}{143}+\dfrac{1}{143}\right)\)
\(B=\dfrac{4}{3}\)x\(\dfrac{9}{8}\)x\(\dfrac{16}{15}\)x\(\dfrac{25}{24}\)x.......x\(\dfrac{121}{120}\)x \(\dfrac{144}{143}\)
\(B=\dfrac{2x2}{1x3}\)x\(\dfrac{3x3}{2x4}\)x\(\dfrac{4x4}{3x5}\)x\(\dfrac{5x5}{4x6}\)x.......x\(\dfrac{11x11}{10x12}\)x\(\dfrac{12x12}{13x11}\)
\(B=\dfrac{2x3x4x5x......x10x11x12}{1x2x3x......x10x11x12}\)x \(\dfrac{2x3x4x5x....x11x12}{3x4x5x6x......x12x13}\)
B= \(\dfrac{12}{1}\)x\(\dfrac{2}{13}\)
B=\(\dfrac{24}{13}\)
Câu hỏi:
\(B=\left(1+\dfrac{1}{8}\right)\)x\(\left(1+\dfrac{1}{15}\right)\)x\(\left(1+\dfrac{1}{24}\right)\)x..... x \(\left(1+\dfrac{1}{440}\right)\)x \(\left(1+\dfrac{1}{483}\right)\)
\(\dfrac{1}{10}+\dfrac{1}{15}+\dfrac{1}{21}+...+\dfrac{1}{120}\)