6) 5x^2+x-6=0 7) 3x^2+6x+3=0 8) x^2+4x+5=0 9) 4x^2-11x-7=0 - вопрос №573555265260732630824509421170105224 от galeevaazaliyaqwert 03.03.2021 08:51

Question

Алгебра: 6) 5x^2+x-6=0 7) 3x^2+6x+3=0 8) x^2+4x+5=0 9) 4x^2-11x-7=0 10) 5(x-2)^2-45x=0

galeevaazaliyaqwert · Answer

6) 5х^2+х-6=0Д=1-4×5×(-6)=1+120=121=11^2х1=(-1-11)÷2×5=-12/10=-1,2х2=(-1+11)÷10= 10/10=17) 3х^2+6х+3=0 Д= 36-4×3×3=36-36=0х= (-6-0)/2×3=-6/6=-1...