Ответы на вопрос:
1) ( 2x-9)^2=(2x-3)*(2x+3) 4x^2-36x+81=4x^2-9 4x^2-4x^2-36x+90=0 36x=90 x=2.52) (5y-2)^2-(5y+3)=5 25y^2-20y+4-5y-3-5=0 25y^2-25y-4=0 d=625-400=225, 2 корня y1=25+15/50=40/50=0.8 y2=25-15/50=10/50=1/5=0.2
1. x=4y x-y=10 < => x=4y 4y-y=10 < => x=4y 3y=10 < => x=4y y=10/3 < => x=40/3 y=10/3 2. y=6x 4x+y=150 < => y=6x 4x+6x=150 < => y=6x 10x=150 < => y=6x x=15 < => y=90 x=15 3. 5x-3y=14 2x+y=10 < => y=10-2x 5x-3(10-2x)=14 < => 5x-30+6x=14 y=10-2x < => 11x=44 y=10-2x < => x=4 y=2 4. 7x-2y=15 2x+y=9 < => y=9-2x 7x-2y=15 < => y=9-2x 7x-2(9-2x)=15 < => y=9-2x 7x-18+4x=15 < => y=9-2x 11x=33 < => x=3 y=3
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