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\(1\frac{1}{2}\times1\frac{1}{3}\times1\frac{1}{4}\times1\frac{1}{5}\times...1\frac{1}{9}+2005.\)
\(=\frac{3}{2}\times\frac{4}{3}\times\frac{5}{4}\times\frac{6}{5}\times...\times\frac{10}{9}+2005\)
\(=\frac{10}{2}+2005=5+2005=2010\)
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A) x/y-3/8=1 x/y-3/8=1/2 B)4/9:x/y=1 4/9:x/y=2/3
x/y=1+3/8 x/y=1/2+3/8 x/y=4/9:1 x/y=4/9:2/3
x/y=8/8+3/8 x/y=4/8+3/8 x/y=4/9 x/y=2/3
x/y=11/8 x/y=7/8
\(1\frac{1}{15}\cdot1\frac{1}{16}\cdot1\frac{1}{17}\cdot...\cdot1\frac{1}{2006}\)
\(=\frac{16}{15}\cdot\frac{17}{16}\cdot\frac{18}{17}\cdot...\cdot\frac{2007}{2006}\)
\(=\frac{16\cdot17\cdot18\cdot...\cdot2007}{15\cdot16\cdot17\cdot...\cdot2006}\)
\(=\frac{2007}{15}\)
1\(\frac{1}{15}\) x 1\(\frac{1}{16}\) x 1\(\frac{1}{17}\) x ............ x 1\(\frac{1}{2016}\)
= \(\frac{16}{15}\)x \(\frac{17}{16}\)x \(\frac{18}{17}\)x ................. x \(\frac{2017}{2016}\)
= \(\frac{1}{15}\)x 2017
= \(\frac{2017}{15}\)
\(1\dfrac{1}{15}\times1\dfrac{1}{16}\times1\dfrac{1}{17}\times...\times1\dfrac{1}{2006}\\ =\dfrac{16}{15}\times\dfrac{17}{16}\times\dfrac{18}{17}\times...\times\dfrac{2007}{2006}\\ =\dfrac{2007}{15}\\ =\dfrac{669}{5}\)
\(3\dfrac{1}{5}=\dfrac{16}{5}=3,2\)
\(-1\dfrac{1}{4}=-\dfrac{5}{4}=-1,25\)
Vậy X = \(1\frac{1}{5}\times1\frac{1}{6}\times....\times1\frac{1}{2014}=\frac{6}{5}\times\frac{7}{6}\times....\times\frac{2015}{2014}\)
\(X=\frac{\left(6\times7\times8\times....\times2014\right)\times2015}{\left(6\times7\times8\times....\times2014\right)\times5}\)
\(X=\frac{2015}{5}=403\)
3\(\dfrac{5}{6}\) \(\times\) 1\(\dfrac{3}{23}\)
= \(\dfrac{23}{6}\) \(\times\) \(\dfrac{26}{23}\)
= \(\dfrac{23}{3}\)
Bài 1: Số tự nhiên thỏa mãn: 12
Bài 2: 1m3 25cm3 = 1000025 cm3
Bài 3:
\(1\frac{1}{4}.1\frac{1}{3}=1\frac{1}{3}\) ( S)
3,25 giờ = 3 giờ 25 phút: (S)
Bài 1: x= 12.
Bài 2: 1, 025.
Bài 3: Cả hai câu đều sai nha.
Nhớ k đúng cho mình nha. Thanks.
\(x-1\dfrac{3}{5}=2\dfrac{1}{1}\)
\(x-\dfrac{8}{5}=3\)
\(x=3+\dfrac{8}{5}\)
\(x=\dfrac{23}{5}\)
\(x-1\dfrac{3}{5}=2\dfrac{1}{1}\)
\(x-\dfrac{8}{5}=3\)
\(x=3+\dfrac{8}{5}\)
\(x=\dfrac{23}{5}\)