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A = \(\left(\frac{3}{10}+\frac{4}{5}x\frac{1}{2}\right):\left(1\frac{8}{9}-1\frac{1}{3}\right)\)
= \(\left(\frac{3}{10}+\frac{4}{10}\right):\left(\frac{17}{9}-\frac{4}{3}\right)\)
=\(\frac{7}{10}:\left(\frac{17-12}{9}\right)\)
= \(\frac{7}{10}:\frac{5}{9}\)
= \(\frac{7}{10}x\frac{9}{5}\)
= \(\frac{63}{50}\)
\(A=\left(\frac{3}{10}+\frac{4}{5}\times\frac{1}{2}\right):\left(1\frac{8}{9}-1\frac{1}{3}\right)\)
\(\Rightarrow A=\left(\frac{3}{10}+\frac{2}{5}\right):\left(\frac{17}{9}-\frac{4}{3}\right)\)
\(\Rightarrow A=\frac{7}{10}:\frac{5}{9}\)
\(\Rightarrow A=\frac{63}{50}\)
tíc mình nha
a)13x3x32,27+67,63x39
=39x32,27+67,63x39
=39x(32,27+67,63)
=39x100
=3900
b,= 1- [ 1/2 x 1/3 x1/4 x..... x 1/100 ]
=1/2 x 2/3 x 3/4 x .......x 99/100
= 1x2x3x......x99 / 2x3x4x...... x100 [ rút gọn ]
= 1/100
a)\(\frac{8}{13}+\frac{4}{9}+\frac{1}{3}+\frac{5}{13}+3\)
\(=\left(\frac{8}{13}+\frac{5}{13}\right)+\left(\frac{4}{9}+\frac{1}{3}\right)+3\)
\(=1+\left(\frac{4}{9}+\frac{3}{9}\right)+3\)
\(=1+\frac{7}{9}+3\)
\(=1+3+\frac{7}{9}\)
\(=4\frac{7}{9}\)
\(=\frac{43}{9}\)
b)\(\frac{8}{5}\cdot\frac{4}{7}+\frac{4}{7}\cdot\frac{2}{5}-1\)
\(=\frac{4}{7}\cdot\left(\frac{8}{5}+\frac{2}{5}\right)-1\)
\(=\frac{4}{7}\cdot2-1\)
\(=\frac{8}{7}-1\)
\(=\frac{1}{7}\)
a) \(\frac{8}{13}+\frac{4}{9}+\frac{1}{3}+\frac{5}{13}+3\)
\(=\left(\frac{8}{13}+\frac{5}{13}\right)+\left(\frac{4}{9}+\frac{3}{9}\right)+3\)
\(=1+\frac{7}{9}+3=4\frac{7}{9}\)
b)\(\frac{8}{5}.\frac{4}{7}+\frac{4}{7}.\frac{2}{5}-1\)
\(=\frac{4}{7}.\left(\frac{8}{5}+\frac{2}{5}\right)-1\)
\(=\frac{4}{7}.2-1\)
\(=\frac{8}{7}-\frac{7}{7}=\frac{1}{7}\)
63,888