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\(=\frac{3}{5}:\left(-\frac{7}{30}\right)+\frac{3}{5}:\left(-\frac{7}{5}\right)=\frac{3}{5}.\left(-\frac{30}{7}\right)+\frac{3}{5}.\left(-\frac{5}{7}\right)=\frac{3}{5}.\left(-\frac{30}{7}-\frac{5}{7}\right)=\frac{3}{5}.\left(-5\right)=-3\)
a: \(=\left(\dfrac{2}{18}-\dfrac{15}{18}-\dfrac{72}{18}\right):\left(\dfrac{21}{36}-\dfrac{1}{36}-\dfrac{360}{36}\right)\)
\(=\dfrac{-85}{18}:\dfrac{-170}{18}\)
\(=\dfrac{85}{170}=\dfrac{1}{2}\)
b: \(=\left(\dfrac{5}{8}-\dfrac{5}{6}-\dfrac{5}{32}+\dfrac{5}{64}\right):\left(1-\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{8}\right)\)
\(=\dfrac{-55}{192}:\dfrac{3}{8}=\dfrac{-55}{192}\cdot\dfrac{8}{3}=-\dfrac{55}{72}\)
a. ( x+1/4 ) : 3/7 = 1/6
x + 1/4 = 1/6 . 3/7 = 1/14
x= 1/14 - 1/4 = -5/28
b. ( 3/15 - x ) .1/3 = 2/5
3/15 - x = 2/5 : 1/3 = 2/5 . 3 = 6/5
x = 3/15 - 6/5 = 3/15 - 18/15 = -15/15 = -1
\(\dfrac{3}{5}:\left(-\dfrac{1}{15}-\dfrac{1}{6}\right)+\dfrac{3}{5}:\left(-\dfrac{1}{3}-1\dfrac{1}{15}\right)\)
\(=\dfrac{3}{5}:\left(-\dfrac{2}{30}-\dfrac{5}{30}\right)+\dfrac{3}{5}:\left(-\dfrac{1}{3}-\dfrac{16}{15}\right)\)
\(=\dfrac{3}{5}:\left(-\dfrac{7}{30}\right)+\dfrac{3}{5}:\left(-\dfrac{7}{5}\right)\)
\(=\dfrac{3}{5}.\left[\left(-\dfrac{30}{7}\right)+\left(-\dfrac{5}{7}\right)\right]\)
\(=\dfrac{3}{5}.-5\)
\(=-3\)