S=a.v
a=6+12=18
v=√(10²-6²)=√(100-36)=√64=8
S=18.8
S=144
(x+y)/y : (x²+2xy+y²) - xy/(x+y)=(x+y)/x . xy²/(x+y)² - xy/(x+y)=
=xy/(x+y) - xy/(x+y)=0
2/3.√150.1/4.2√6=2/3√(25.6) .1/2√6=10/3√6-1/2√6=(10/3-1/2)√6=17/6.√6
x²+3=10x-6, x²-10x+9=0, (x-1)(x-9)=0, x1=1, x2=9
∠MOK=2.72°=144°
3(x+4)-2(x-2)≥4(x+2)
3x+12-2x+4≥4x+8
x+16≥4x+8
3x≤8, x≤8/3, x∈(-∞,8/3/
v.t=400, (v+20)(t-1)=400
(v+20)(t-1)=vt
vt-v+20t-20=vt
-v=20-20t,v=20t-20=20(t-1)
abtobyc: s=400,v=20(t-1), t=t
20(t-1).t=400, t=5
v=20.4=80 km/č
S=(a+c).v/2,
150°-90°=60°
v/6=cos60°, v=6.1/2=3(cm)
S=(11+3).3/2=14.3/2=7.3=21cm²