(x-2)^2+2(x+1)^2=8; x^2+x=1.5x^2; 25x^2=(4x)^2+(3x)^2 - вопрос №490041122212821522524232 от AnastasiyaSm 27.02.2020 12:11

Question

Алгебра: (x-2)^2+2(x+1)^2=8; x^2+x=1.5x^2; 25x^2=(4x)^2+(3x)^2 нужны

AnastasiyaSm · Answer

1)х^2-4х+4+2(х^2+2х+1)=8х^2-4х+4+2х^2+4х+2-8=03х^2=2х^2=2/3х=корень(2/3)2) х^2+х=1,5х^20,5х^2+х=0х(0,5х+1)=0х1=00,5х=-1х2=-23) 25х^2=(4х)^2+(3х)^225х^2=16х^2+9х^225х^2=25х^2...