2/3-1/6=4/6-2/6=2/6=1/3
-1/3-3/5=-5/15-9/15=-14/15
3/8+1/2=3/8+4/8=7/8
63-18-7=38 черепах
======================================
К = 3m - 4n
M= -5m -11n
L = -6n + 2m
Решение:
a) -K - L + M
-(3m - 4n)-(-6n + 2m)+(-5m -11n)=<u>-3m</u>+4n+6n<u>-2m-5m</u>-11n=-10m-n
б) K + L - M
(3m - 4n)+(-6n + 2m)-(-5m -11n)=<u>3m</u>-4n-6n<u>+2m+5m</u>+11n=10m+n
<span><span>в кастрюлю 7/с
с-7/с=с^2-7</span></span>