По формуле разности квадратов:
(10a-1)(10a+1)
А1=-3,а2=1,а3=5
d=a2-a1=1-(-3)=1+3=4
a(101)=a1+100d=-3+100*4=-3+400=397
<span>sin^2 (A)+ cos^2(A)=1 cos(A)=0,6</span>
<span><span>AB=BD=x x^2=x^2+144-24x*0,6 x=10</span></span>
<span><span>S=10*12*0,8=96</span></span>