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\(\dfrac{-12}{-7\dfrac{1}{3}}=\dfrac{1.6}{55};\dfrac{1.6}{-12}=\dfrac{-7\dfrac{1}{3}}{55};\dfrac{-7\dfrac{1}{3}}{-12}=\dfrac{55}{1.6}\)
\(Từ\) \(\dfrac{-1,2}{1,6}=\dfrac{55}{-7\dfrac{1}{3}}\Rightarrow\) \(\dfrac{1,6}{-1,2}=\dfrac{-7\dfrac{1}{3}}{55}\)
\(\Rightarrow\dfrac{-7\dfrac{1}{3}}{55}=\dfrac{1,6}{-1,2}\)
\(\Rightarrow\dfrac{55}{-7\dfrac{1}{3}}=\dfrac{-1,2}{1,6}\)
1)
a) \(1\dfrac{5}{6}=\dfrac{-x}{5}\)
\(\Rightarrow\dfrac{11}{6}=\dfrac{-x}{5}\)
\(\Rightarrow-x=\dfrac{5.11}{6}=\dfrac{55}{6}\)
\(\Rightarrow x=-\dfrac{55}{6}\)
b) 4,25 : 8 = -3,5 : x
\(\dfrac{4,25}{8}=\dfrac{-3,5}{x}\)
\(x=\dfrac{-3,5.8}{4,25}\)
\(x=\dfrac{-28}{4,25}\)
2.
\(-\dfrac{12}{1,6}=\dfrac{55}{-7\dfrac{1}{3}}\)
\(\Rightarrow-\dfrac{12}{1,6}=\dfrac{55}{-\dfrac{22}{3}}\)
Ta có thể lặp đc các tỉ lệ thức sau:
\(-\dfrac{12}{1,6}=\dfrac{55}{-\dfrac{22}{3}}\)
\(\dfrac{-\dfrac{22}{3}}{1,6}=\dfrac{55}{-12}\)
\(-\dfrac{12}{55}=\dfrac{1,6}{-\dfrac{22}{3}}\)
\(\dfrac{1,6}{-12}=\dfrac{-\dfrac{22}{3}}{55}\)
a) \(\dfrac{-2}{5}=\dfrac{-14}{35}\)
b) \(\dfrac{9}{4}=\dfrac{\dfrac{1}{4}}{\dfrac{1}{9}}\)
c) \(\dfrac{\dfrac{7}{4}}{\dfrac{1}{2}}=\dfrac{7}{2}\)
-7 1/3 = -22/3
55/(-22/3) = -15/2 = -7,5
====> -12/1,6 = 55/-7,5
======> 1,6/-12 = -7,5/55 ; 1,6/-7,5 = -12/55 ; -7,5/1,6 = 55/-12
( Mk gj hơi khó hỉu, moq pn pỏ wa nhé!! )
\(\dfrac{-12}{1,6}=\dfrac{55}{-7\dfrac{1}{3}}\)
\(\Rightarrow\dfrac{-12}{-7\dfrac{1}{3}}=\dfrac{55}{1,6};\dfrac{-12}{55}=\dfrac{-7\dfrac{1}{3}}{1,6};\dfrac{1,6}{55}=\dfrac{-7\dfrac{1}{3}}{-12};\dfrac{1,6}{-7\dfrac{1}{3}}=\dfrac{55}{-12}\)