Sagot :
[tex]\frac { 20 }{ 36 } \\ \\ =\frac { 5 }{ 9 } \cdot \frac { 4 }{ 4 } \\ \\ =\frac { 5 }{ 9 } \cdot 1\\ \\ =\frac { 5 }{ 9 } [/tex]
[tex] \frac{20}{36} \\
\\ \frac{5}{9} \ x \ \frac{4}{4} \ = \frac{20}{36}
\\ \frac{4}{4} \ = \ 1
\\ \frac{5}{9} \ x \ 1 \ = \ \frac{5}{9}
\\ Solution: \frac{5}{9} \\
[/tex]