B= 16 2\7:(-3\5)- 28 2\7:(-3\5)
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\(16\frac{2}{7}\):\(\left(\frac{-3}{5}\right)\)+ \(28\frac{2}{7}\):\(\frac{3}{5}\)
= \(-16\frac{2}{7}\):\(\frac{3}{5}\)+\(28\frac{2}{7}\):\(\frac{3}{5}\)
=(\(-16\frac{2}{7}\)+\(28\frac{2}{7}\)) : \(\frac{3}{5}\)
=12 : \(\frac{3}{5}\)=12.\(\frac{5}{3}\)=20
\(16\dfrac{2}{7}:\left(\dfrac{-3}{5}\right)+28\dfrac{2}{7}:\dfrac{3}{5}\)
\(=\left(-16-\dfrac{2}{7}+28+\dfrac{2}{7}\right)\cdot\dfrac{5}{3}\)
\(=12\cdot\dfrac{5}{3}=20\)
\(16\dfrac{2}{7}:\left(\dfrac{-3}{5}\right)+28\dfrac{2}{7}:\dfrac{3}{5}\)
\(=\left(-16-\dfrac{2}{7}\right)\cdot\dfrac{5}{3}+\left(28+\dfrac{2}{7}\right)\cdot\dfrac{5}{3}\)
\(=12\cdot\dfrac{5}{3}=20\)
a: 7/4=28/16
15/16=15/16
b: 1/8=3/24
2/3=16/24
5/2=60/24
c: 2/7=8/28
9/4=63/28
5/28=5/28
a)\(x=\left(\dfrac{3}{56}\cdot\dfrac{28}{9}\right):\dfrac{-3}{7}=\dfrac{1}{6}:\dfrac{-3}{7}=-\dfrac{7}{18}\)
b)\(x=\left(\dfrac{7}{15}\cdot\dfrac{5}{3}\right)+\dfrac{3}{16}=\dfrac{7}{9}+\dfrac{3}{16}=\dfrac{139}{144}\)
\(B=\dfrac{-5}{3}\left(16+\dfrac{2}{7}-28-\dfrac{2}{7}\right)=-12\cdot\dfrac{-5}{3}=20\)