(3y²+5)(y-6)=3y³+5y-18y²-30=3y³-18y²+5y-30
(7c²-1)(c-3)=7c³-c-21c²+3=7c³-21c²-c+3
1) 4/2a-1+3-2a/1-2a=0
4/2a-1-3-2a/2a-1=04-3-2a=0
-2a=-1
a=1/2
2) x²/x-3+9/3-x
x²/x-3-9/x-3
x²-9=0
x=+-3
cред аримфметич
1.4 + 1.8 + 1.1 + 2 + 4.7 + 1 + 2 + 2 = 16
16/8=2
Медиана
1.4 + 1.8 + 1.1 + 2 + 4.7 + 1 + 2 + 2 = 16
16/2 + 16/2 = 16
16=16
3y-y-2=5-y
3y=7
Y=7:3
Y=2.1/3