<span>2+2=23-у+х
y=23+x-4
y=x+19</span>
<span>-5х(х-0,4)-3(-1,2-0,5х)=
=-5x</span>²+2x+3.6+1.5x=
=-5x²+3.5x+3.6
а) 2cos150° - 3tq405° =2cos(180° -30°) -3tq(360°+45°) = -2cos30° -3tq45° =
-2*√3/2 -3*1 = -√3 - 3.
б) sin 7π/6 - cos2π/3 =sin(π +π/6) -cos(π-π/3) = -sinπ/6 +cosπ/3 = -1/2 +1/2 = 0.
<span>y=5x-10
а) у(20)=5*20-10=90
б) 20=5х-10
30=5х
х=6
в) -11=5*0-10 не верно, значит не проходит
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