Question

15/20 ÷ 21/32 + 9/7 × 1/4 - 65/45 ÷ 78/54=

Answer 1

Respuesta:

$\frac{15}{20}:\frac{21}{32}+\frac{9}{7}*\frac{1}{4}-\frac{65}{45}:\frac{78}{54}\\\\=\frac{480}{420} +\frac{9}{28}-\frac{3510}{3510} \\\\=\frac{32}{28} +\frac{9}{28}-\frac{28}{28} \\\\=\frac{13}{28}$