(1,6.2,5.10ˇ4)/(0,4.10ˇ3=(4.10ˇ4)/(4.10ˇ2)=10ˇ2=100
(3-5x)(x-4)-(5x+1)(2-x)=3x-12-5x²+20x-(10x-5x²+2-x)=<u>3x</u>-12-5x²+<u>20x</u>-<u>10x</u>+5x²-2+<u>x</u>=14x-14 -5x² и 5x² сокращяются
Lg(x +1)/x > 0 (x +1)/x > 0
------------------ -1-------------------0------------ x∉(-1;0)
+ - +
(x +1)/x > 1 1+1/x-1 > 0 → 1/x> 0 x> 0