Question

Срочно! Помогите решить простые задачи

Answer 1

(n-k)/15 -n/15 = (n-k-n)/15 = -k/15
(a+b)/7 -b/7 = (a+b-b)/7 = a/7
(x+45)/6 -(x+29)/6 = (x+45-x-29)/6 = 16/6 = 8/3 =2 2/3
(4a+7b)/6 -(b-4a)/6 = (4a+7b-b+4a)/6 = (8a+6b)/6 = (4a+3b)/3 = 4a/3 +b
(12a-5)/a -(3a-17)/a = (12a-5-3a+17)/a = (9a+12)/a = 9a/a +12/a = 9 +12/a

Answer 2

$a) \frac{n-r}{15} - \frac{n}{15} = \frac{n-r-n}{15}=- \frac{r}{15} \\b) \frac{a+b-b}{7}= \frac{a}{7} \\c) \frac{x+45}{6}- \frac{x+29}{6}= \frac{x+45-x-29}{6}= \frac{16}{6}= \frac{8}{3}=2 \frac{2}{3} \\g) \frac{4a+7b-b+4a}{6}= \frac{8a+6b}{6}= \frac{2(4a+3b)}{6}= \frac{4a+3b}{3}= \frac{4a}{3}+ \frac{3b}{3} =b+ \frac{4a}{3} \\d) \frac{12a-5}{a}- \frac{3a-17}{a}= \frac{12a-5-3a+17}{a}= \frac{9a+12}{a}= \frac{9a}{a}+ \frac{12}{a}=9+ \frac{12}{a}$