1. A) √50+3√32-5√18=5√2+3*4√2-5*3√2=5√2+12√2-15√2=2√2
2.82843
Б) √3*(√27-√6)+1/2*√8=√3*(3√3-√6)+1/2*2√2=9-√18+√2=9-3√2+√2=9-2√2
6,17157
В )(5+√7):2=25+10√7+7=32+10√7
58,4575
2. А) x^2-0.25=0
x^2-25/100=0
x^2-1/4=0
x^2=1/4
x= + - 1/2
x=1/2 x= - 1/2
Б)x^2=3
x^2-3x=0
x(x-3)=0
x=0
x-3=0
x=0 x=3
В)3x^2-81=0
3x^2=81
x^2=27
x= + - 3√3
x=3√3 x= - 3√3