tìm x biết : {1/2+1/6+1/8+1/16}:x=1/2+1/6+1/12+1/20+...+1/132 .CÁC BẠN GIÚP MÌNH NHA
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Tìm x biết (1/2+1/4+1/8+1/16):x=1/2+1/6+1/12+1/20+...+1/132
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Tìm x biết (1/2+1/4+1/8+1/16):x=1/2+1/6+1/12+1/20+...+1/132
Ta có:
(1/2 + 1/4 + 1/8 + 1/16) = 8/16 + 4/16 + 2/16 + 1/16 = 15/16.
1/2 + 1/6 + 1/12 + 1/20 +…+ 1/132 = 1/(1.2) + 1/(2.3) + 1/(3.4) + 1/(4.5) +…+1/(11.12)
= (1 – 1/2) + (1/2 – 1/3) + (1/3 – 1/4) + (1/4 – 1/5) +…+ (1/11 – 1/12)
= 1 – 1/12 = 11/12
Vậy x = (15/16) : (11/12) = 45/44.
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(1/2+1/4+1/8+1/16):x=1/2+1/6+1/12+1/20+...+1/132
(1-1/2+1/2-1/4+1/4-1/8+1/8-1/16):x=1/1x2+1/2x3+1/3x4+1/4x5+...+1/11x12
(1-1/16):x=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+...+1/11-1/12
15/16:x=1-1/12
15/16:x=11/12
x=15/16:11/12
x=45/44
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Tìm x biết (1/2+1/4+1/8+1/16):x=1/2+1/6+1/12+1/20+...+1/132
tìm x
[ 1/2 + 1/4 + 1/8 + 1/16 ] : x = 1/2 + 1/6 + 1/12 + 1/20 + .......+ 1/132
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2.tìm x:c.1/3+1/15+1/63+.................+1/x=20/21
d.x*(1975/8*9+1885/9*10+17555/10*11+1579/11*12+6)=1/24
e.(1/2+1/4+1/8+1/16):x=1/2+1/6+1/12+1/20+..................+1/132
3.so sánh:1/2*2+1/3*3+1/4*4+..............+1/2017*2017 với 1.
Ai nhanh nhất mình **** cho cảm ơn các bạn nhiều nếu nhanh mình kết bạn nhé.
;
K CHO MIK TRƯỚC ĐI R MIK TRẢ LỜI CHO NHÁK
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(1/2+1/4+1/8+1/16):x=1/2+1/6+1/12+...+1/132
giúp mình với mình đang cần gấp !!! O^O
Trả lời:
1/2+1/4+1/8+1/16=8/16+4/16+2/16+1/16=15/16 (1)
1/2+1/6+1/12+...+1/132=1/(1.2)+1/(2.3)+1/(3.4)+...+1/(11.12)
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/11-1/12)
=1-1/12=11/12 (2)
Từ (1) và (2) => (15/16) : (11/12) = 45/44
<1/2+1/4+1/8+1/16> x y =1/2+1/6+1/12+1/20+........+1/132
mình đang cần liền ai nhanh mình tick
(1/2+1/4+1/8+1/16):x=1/2+1/6+1/12+1/20+...+1/132
tìm x biết: \(\frac{\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)}{x}=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{132}\)
Ta có \(\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right):x=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{132}\)
\(\frac{15}{16}:x=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{11.12}\)
\(\frac{15}{16}:x=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{11}-\frac{1}{12}\)
\(\frac{15}{16}:x=1-\frac{1}{12}\)
\(\frac{15}{16}:x=\frac{11}{12}\)
\(x=\frac{15}{16}:\frac{11}{12}\)
\(x=\frac{180}{176}\)
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