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(ab+b^2)(a^2+6a) - (a^2+ab)(b^2+6b)=a^3b+6a^2b+a^2b^2+6ab^2-a^2b^2+6a^2b+ab^3+6ab^2=a^3b+12a^2b+12ab^2
f(x)' = (x^2/2x-1)' = ( (x^2)' (2x-1) -x^2*(2x-1)' ) / (2x-1)^2 =
= ( 2x (2x-1) - x^2*2 ) / (2x-1)^2 = ( 4x^2 -2x - 2 x^2 ) / (2x-1)^2 =
= ( 2x^2 -2x ) / (2x-1)^2 = 2x( x -1 ) / (2x-1)^2
4x-10=x+5. 4x-x=5+10. 3x=15. X=15:3. X=50
<span>2√8+0,5√32+1/3√18=2√2*4+0,5√2*16+1/3√2*9=4√2+2√2+3√2=9√2</span>