Question

[Hoàng Khánh Ly]

a,x-1/4=5/8.2/3        b,x/126=-5/9.4/7

ai làm nhanh và chính xác mk sẽ tick

Answer 1

[công chúa xinh xắn]

\(a,x-\frac{1}{4}=\frac{5}{8}\times\frac{2}{3}\)

    \(x-\frac{1}{4}=\frac{5}{12}\)

               \(x=\frac{5}{12}+\frac{1}{4}\)

               \(x=\frac{2}{3}\)

\(b,\frac{x}{126}=-\frac{5}{9}\times\frac{4}{7}\)

    \(\frac{x}{126}=-\frac{20}{63}\)

\(\Rightarrow63\times x=\left(-20\right)\times126\)

\(\Rightarrow63\times x=-2520\)

\(\Rightarrow x=\left(-2520\right):63\)

\(\Rightarrow x=-40\)

Answer 2

[Mai Đức Dũng]

\(a,x-\frac{1}{4}=\frac{5}{8}\cdot\frac{2}{3}\)

    \(x-\frac{1}{4}=\frac{5}{12}\)

              \(\Rightarrow x=\frac{5}{12}+\frac{1}{4}\)

                   \(x=\frac{2}{3}\)

\(b,\frac{x}{126}=-\frac{5}{9}\cdot\frac{4}{7}\)

   \(\frac{x}{126}=-\frac{20}{63}\)

\(\Rightarrow63\cdot x=\left(-20\right)\cdot126\)

\(\Rightarrow x=\left(2520\right):63\)

    \(x=-40\)