\(\dfrac{4}{6}-\dfrac{3}{5}=\dfrac{2}{3}-\dfrac{3}{5}=\dfrac{1}{15}\\ x=\dfrac{2}{3}-\dfrac{8}{21}=\dfrac{2}{7}\\ x=\dfrac{6}{7}\times\dfrac{1}{7}=\dfrac{6}{49}\\ 2-x=\dfrac{7}{9}\\ x=2-\dfrac{7}{9}=\dfrac{11}{9}\)
Đúng 9
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\(a,\dfrac{4}{6}-\left(\dfrac{6}{15}+\dfrac{1}{5}\right)=\dfrac{4}{6}-\dfrac{3}{5}=\dfrac{1}{15}\)
\(b,x=\dfrac{2}{3}-\dfrac{8}{21}\)
\(x=\dfrac{2}{7}\)
\(c,x=\dfrac{6}{7}\times\dfrac{1}{7}\)
\(x=\dfrac{6}{49}\)
\(d,2-x=\dfrac{7}{9}\)
\(x=2-\dfrac{7}{9}\)
\(x=\dfrac{11}{9}\)
Đúng 6
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