Question

Решитее...... Пж....

Answer 1

1..S*(7-5r)-r*(8-5s)/rs
7s-5rs-8r+5rs/rs
7s-8r/rs
2..4t*(9-5z)+5z*(5+4t)/20tz
36t-20tz+25z+20tz/20tz
36t-25z/20tz

Answer 2

1) $\frac{7-5r}{r}-\frac{8-5s}{8}$

$\frac{8(7-5r)-r(8-5s)}{8r}$

$\frac{56-40r-8r+5rs}{8r}$

$\frac{56-48r+5rs}{8r}$

2) $\frac{9-5z}{5z}+\frac{5+4t}{4t}$

$\frac{4t(9-5z)+5z(5+4t)}{20tz}$

$\frac{36t-20tz+25z+20tz}{20tz}$

$\frac{36t+25z}{20tz}$

3)$\frac{7}{a}+ \frac{b}{5a}$

$\frac{35}{5a}+\frac{b}{5a}$

$\frac{35+b}{5a}$

4)$\frac{5y}{8x}-\frac{7y}{24x}$

$\frac{8y}{24x}$

$\frac{y}{3x}$