-0,4(3x-1)+8(0,8x-0,3)=5-(3,8x+4)
-1,2x+0,4+6,4x-2,4=5-3,8x-4
5,2x+3,8x=1-0,4+2,4
9x=3
x=1/3
1) 4/(x²+4x+4)=4/(x+2)².
2) (x²+12)/(x²-4)-(x+2)/(x-2)=(x²+12)/((x-2)(x+2))-(x+2)/(x-2)=
=(x²+12-(x+2)²)/((x+2)(x-2))=(x²+12-x²-4x-4)/((x+2)(x-2))=(-4x-8)/((x+2)(x-2))=
=-4*(x-2)/((x+2)(x-2))=-4/(x+2).
3) (4/(x+2)²):(-4/(x+2))=4*(x+2)/(-4*(x+2)²)=-1/(x+2)=-1/(-1+2)=-1/1=-1.
А) (3х-5)(3х+5)
б) 3(-а+2а-1)
в) (у-2х)(4х^2+2ху+у^2)
Не сложная система, а громоздкая...
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