S=12/3600*210=21/30<span>км= 700</span>
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(-4)^2+3*(-4)+m=0
16-12+m=0
m=-4
A^2+4/a^2-4-a/a+2 при a=2/3
(2/3)^2+4*9/4-4-2/3*3/2+2=4/9+9-4-1+2=4/9+6
при a= -4
(-4)^2+4/(-4)^2-4-(-4/-4)+2=16-1/4-7-1+2=16-0,25-4=12-0,25=11,75
при a=2
2^2+4/2^2-4-2/2+2=4+1-4-1+2=2
160 уч - 100\%
24 уч - х
х= 24*100/160
х= 15\%