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\(\frac{7500-100}{600-35}=\frac{7400}{565}=\frac{1480}{113}\)
\(\frac{x}{8}=\frac{-15}{30}\)
\(\Rightarrow x=\frac{-15.8}{30}\)
\(\Rightarrow x=-4\)
\(\frac{y}{6}=\frac{15}{-45}\)
\(\Rightarrow y=\frac{15.6}{-45}\)
\(\Rightarrow y=-2\)
A) \(\frac{x}{8}=\frac{-15}{30}\)
\(\Leftrightarrow\)\(x=\frac{\left(-15\right).8}{30}=-4\)
Vậy...
B) \(\frac{y}{6}=\frac{15}{-45}\)
\(\Leftrightarrow\)\(y=\frac{15.6}{-45}=-2\)
Vậy....
120/600 = 1/5
60/-135 = -4/9
Ủng hộ nhé ! Bấm Đúng nếu thấy mình trả lời đúng !
\(\frac{-8}{12}=\frac{-2}{3}\)
\(\frac{15}{-60}=\frac{-1}{4}\)
\(\frac{-16}{-72}=\frac{2}{9}\)
\(\frac{35}{14.15}=\frac{1}{6}\)
B=1/3x5 + 1/5x7 + 1/7x9 + 1/9x11 + 1/11x13
B=1/2(2/3x5 + 2/5x7 + 2/7x9 + 2/9x11 + 2/11x13)
B=1/2(1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11 + 1/11 - 1/13)
B=1/2(1/3 - 1/13)
B=1/2 x 10/39
B=5/39
B = 1/3.5 + 1/5.7 + 1/7.9 + 1/9.11 + 1/11.13
2B = 2 ( 1/3.5 + 1/5.7 + 1/7.9 + 1/9.11 + 1/11.13 )
2B = 1/3-1/5+1/5-1/7+1/7-1/9+.....+1/11-1/13
2B = 1/3 - 1/13
2B = 10/39
B = 10/39 . 1/2
B = 10/78
\(\frac{3939-101}{3.2929+505}=\frac{3838}{9292}=\frac{19}{46}\)
\(=\frac{2.4}{3^2}.\frac{3.5}{4^2}....\frac{49.51}{50^2}\)
\(=\frac{2.3....49}{3.4....50}.\frac{4.5....51}{3.4....50}\)
\(=\frac{2}{50}.\frac{17}{1}\)
\(=\frac{17}{25}\)
Ta có : \(A=\frac{8}{9}.\frac{15}{16}.....\frac{2499}{2500}\)
\(A=\frac{8.15.....2499}{9.16.....2500}\)
\(A=\frac{\left(2.4\right).\left(3.5\right).....\left(49.51\right)}{\left(3.3\right).\left(4.4\right).....\left(50.50\right)}\)
\(A=\frac{\left(2.3....49\right).\left(4.5....51\right)}{\left(3.4....50\right).\left(3.4.....50\right)}\)
\(A=\frac{2\left(3.4.....49\right).\left(4.5.....50\right).51}{\left(3.4.....49\right).50.3.\left(4.5.....50\right)}\)
\(A=\frac{2.51}{3.50}\)
\(A=\frac{2.17.3}{3.25.2}\)
\(A=\frac{17}{25}\)
\(\frac{7500-100}{600-35}=\frac{7400}{565}=\frac{1480}{113}\)