\(a,3-x=\dfrac{5}{7}\\ x=3-\dfrac{5}{7}\\ x=\dfrac{16}{7}\\ b,\dfrac{7}{13}:x=\dfrac{14}{39}\\ x=\dfrac{7}{13}:\dfrac{14}{39}\\ x=\dfrac{3}{2}\\ c,x\times\dfrac{3}{5}=\dfrac{14}{15}\\ x=\dfrac{14}{15}:\dfrac{3}{5}\\ x=\dfrac{14}{9}\\ d,x-\dfrac{5}{8}=1\dfrac{3}{4}\\ x-\dfrac{5}{8}=\dfrac{7}{4}\\ x=\dfrac{7}{4}+\dfrac{5}{8}\\ x=\dfrac{19}{8}\)
a: x=3-5/7=21/7-5/7=16/7
b: x=7/13:14/39=7/13*39/14=39/13*7/14=3*1/2=3/2
c: x=14/15:3/5=14/15*5/3=70/75=14/15
d: x=7/4+5/8=14/8+5/8=19/8
\(a)\)
\(3-x=\dfrac{5}{7}\)
\(x=3-\dfrac{5}{7}\)
\(x=\dfrac{16}{7}\)
\(b)\)
\(\dfrac{7}{13}:x=\dfrac{14}{39}\)
\(x=\dfrac{7}{13}:\dfrac{14}{39}\)
\(x=\dfrac{7}{13}\times\dfrac{39}{14}\)
\(x=\dfrac{3}{2}\)
\(c)\)
\(x\times\dfrac{3}{5}=\dfrac{14}{15}\)
\(x=\dfrac{14}{15}:\dfrac{3}{5}\)
\(x=\dfrac{14}{15}\times\dfrac{5}{3}\)
\(x=\dfrac{14}{9}\)
\(d)\)
\(x-\dfrac{5}{8}=1\dfrac{3}{4}\)
\(x-\dfrac{5}{8}=\dfrac{7}{4}\)
\(x=\dfrac{7}{4}+\dfrac{5}{8}\)
\(x=\dfrac{56}{32}+\dfrac{20}{32}\)
\(x=\dfrac{19}{8}\)