Question

2.Using appropriate properties find, (1) -2/5 * 3/5 + 5/2 -3/5 * 1/2​

Answer 1

Answer:

$-\frac{2}{5}\times \frac{3}{5}+\frac{5}{2}-\frac{3}{5}\times \frac{1}{2}=\frac{49}{25}\quad \left(\mathrm{Decimal:\quad }\:1.96\right)$

Step-by-step explanation:

$-\frac{2}{5}\times \frac{3}{5}+\frac{5}{2}-\frac{3}{5}\times \frac{1}{2}$

$=-\frac{6}{25}+\frac{5}{2}-\frac{3}{10}$

$=-\frac{12}{50}+\frac{125}{50}-\frac{15}{50}$

$\mathrm{Apply\:the\:fraction\:rule:\quad \frac{a}{c}\pm \frac{b}{c}=\frac{a\pm \:b}{c}}$

$=\frac{-12+125-15}{50}$

$\mathrm{Add\:the\:numbers:}\:-12+125-15=98$

$=\frac{98}{50}$

$=\frac{49}{25}$