<span>√8*√98/√ 56
=√14
!!!!!!!!!!!!!!!!!!!!
</span>
2/5x²=100/11
x²=500/22
x²=250/11
x₁=5(√10/11)
x₂=-5√(10/11).
F'(x)=(x³/3-7x²/2+5)'=3x²/3-7*2*x²/2=x²-7x
f'(x)<0
x²-7x<0
x(x-7)<0
x∈(0; 7)
Ответ: <span>x∈(0; 7)</span>
15х+6х(2-3х)=9х(5-2х)-36
15х+12х-18х2=45х-18х2-36
15х+12х18х2-45х+18х2=-36
-18х=-36
х=-36:(-18)
х=2
*18х2- это 18х во 2 степени