Решите 1) (y+5)(y-1)=7 2) (3x-5)^+2x=5 3) t(t+2)-3(t-4)=5t+3 - вопрос №7755061151723525323453 от cucumber03 14.10.2020 07:33

Question

Алгебра: Решите 1) (y+5)(y-1)=7 2) (3x-5)^+2x=5 3) t(t+2)-3(t-4)=5t+3

cucumber03 · Answer

1y²-y+5y-5-7=0y²+4y-12=0y1+y2=-4 U y1*y2=-12y1=-6 U y2=229x²-30x+25+2x-5=09x²-28x+20=0D=784-720=64x1=(28-8)/18=10/9x2=(28+8)/18=23t²+2t-3t+12-5t-3=0t²-6t+9=0(t-3)²=0t-3=0t=3...