0,35 5.4 0,05*7*0,6*9 1
-------- * ------- = --------------------------------- = -------------
45 84 0,05*100*9*7*0,6*20 2000
x²-2x-15 (x-5)(x+3) x-5 0,02-5 -4,98
--------------- = ---------------- = ------ при х=0,02 ----------- = --------- = -249
x²+3x x(x+3) x 0,02 0,02
x²-2x-15 =(x-5)(x+3)
D=4+60=64
x=(2+8)/2=5
x=(2-8)/2=-3
(√(27 1/2 ) -√(4 2/5): √(11/90) =(√55/2)*(√90/11) -(√22/5)*(√90/11) =
= √(5*90/2) -√(2*90/5)= √225 -√36 =15-6=9