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\(A=21\frac{4}{11}-\left(1\frac{3}{5}+7\frac{4}{11}\right)\)
\(A=\frac{235}{11}-\left(\frac{8}{5}+\frac{81}{11}\right)\)
\(A=\left(\frac{235}{11}-\frac{81}{11}\right)+\frac{8}{5}\)
\(A=\frac{154}{11}+\frac{8}{5}\)
\(\Rightarrow A=\frac{78}{5}\)
\(B=\left(7\frac{8}{9}+2\frac{3}{13}\right)-\left(4\frac{8}{9}-7\frac{10}{13}\right)\)
\(B=\left(\frac{71}{9}+\frac{29}{13}\right)-\left(\frac{44}{9}-\frac{101}{13}\right)\)
\(B=\left(\frac{71}{9}-\frac{44}{9}\right)+\left(\frac{29}{13}-\frac{101}{13}\right)\)
\(B=\frac{27}{9}+\frac{-72}{13}\)
\(B=3+\frac{-72}{13}\)
\(\Rightarrow B=\frac{-33}{13}\)
P/s: Hoq chắc :v
\(A=7-\frac{3}{4}+\frac{1}{3}-6-\frac{5}{4}+\frac{4}{3}-5+\frac{7}{4}-\frac{5}{3}\)
\(A=7-6-5+\left(\frac{-3}{4}-\frac{5}{4}+\frac{7}{4}\right)+\left(\frac{1}{3}+\frac{4}{3}-\frac{5}{3}\right)\)
\(A=-4-\frac{1}{4}\)
\(A=\frac{-17}{4}\)
#)Giải :
\(A=\left(7-\frac{3}{4}+\frac{1}{3}\right)-\left(6+\frac{5}{4}-\frac{4}{3}\right)-\left(5-\frac{7}{4}+\frac{5}{3}\right)\)
\(A=7-\frac{3}{4}+\frac{1}{3}-6-\frac{5}{4}+\frac{4}{3}-5-\frac{7}{4}+\frac{5}{3}\)
\(A=\left(7-6-5\right)-\left(-\frac{3}{4}-\frac{5}{4}+\frac{7}{4}\right)+\left(\frac{1}{3}+\frac{4}{3}-\frac{5}{3}\right)\)
\(A=-4-\frac{1}{4}+0\)
\(A=-4\frac{1}{4}=-\frac{17}{4}\)
#~Will~be~Pens~#
