Х^2 -6х=3х х^2-6х-3х=0 х^2-9х=0 х(х-9)=0
х1=0
х-9=0 х=9
3 × 5 + 2 × ( - 2 ) = 11.
1) 3 × 5 = 15;
2) 2 × ( - 2 ) = - 4;
3) 15 + ( - 4 ) = 11.
15 - 4 = 11.
Метод подстановки { 5x-4y=13; {5x-4y=13; {5x-4y=13; {5x-8x+16=13; {-3x=-3; {x=1;
2√125-0.5√20+9√45-6√5=2*5√5-0.5*2√5+9*3√5-6√5=10√5-√5+27√5-6√5=30√5
√11²-√2²=11-2=9