15/17x45/33-15/17x12/33
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\(A=\frac{108}{199}\)x\(\left(\frac{107}{211}+\frac{104}{211}\right)\)
\(A=\frac{108}{199}\)x \(\frac{211}{211}\)
\(A=\frac{108}{199}\)x 1
\(A=\frac{108}{199}\)
\(B=\frac{15}{19}\)x \(\left(\frac{27}{33}+\frac{19}{33}-\frac{13}{33}\right)\)
\(B=\frac{15}{19}\)x\(1\)
\(B=\frac{15}{19}\)
\(=\dfrac{15}{17}\left(\dfrac{45}{33}-\dfrac{12}{33}\right)=\dfrac{15}{17}\)
\(\dfrac{15}{19}\times\dfrac{25}{33}-\dfrac{15}{19}\times\dfrac{14}{33}\)
\(=\dfrac{15}{19}\times\left(\dfrac{25}{33}-\dfrac{14}{33}\right)\)
\(=\dfrac{15}{19}\times\dfrac{11}{33}\)
\(=\dfrac{5}{19}\)
Lời giải:
\(\frac{15}{17}\times \frac{45}{33}-\frac{15}{17}\times \frac{12}{33}=\frac{15}{17}\times (\frac{45}{33}-\frac{12}{33})=\frac{15}{17}\times \frac{33}{33}=\frac{15}{17}\times 1=\frac{15}{17}\)
\(\frac{15}{17}\)x \(\left(\frac{45}{33}-\frac{12}{33}\right)\)
\(\frac{15}{17}\)x \(\frac{33}{33}\)
\(\frac{15}{17}\)x \(1\)
\(\frac{15}{17}\)
\(=\dfrac{15}{17}\left(\dfrac{45}{33}-\dfrac{12}{33}\right)\)
\(=\dfrac{15}{17}.\dfrac{33}{33}=\dfrac{15}{17}\)