ОМ = х, тогда DM=х/4
15+x/4=x
-3x/4=-15
3x=60
x=20
отрезок ОМ= 20 см
0,09y^2-1,2p^2=3(0,03y^2-0,4p^2);<span>
<span>a^2b^2-16/9=1/9(9a^2b^2-16)=1/9(3ab-4)
(3ab+4);</span>
<span>a^8-x^4=(a^4)^2
– (x^2)^2 =(a^4- x^2)(a^4+ x^2)=(a^2- x)( a^2+x)(a^4+ x^2);</span>
<span>0,04b^4-a^12=0,04(b^4-25a^12</span>)=
0,04((b^2)^2-(5a^6)^2)=
=0,04(b^2-5a^6)( b^2-5a^6);</span>
<span>-1+a^6b^4=
a^6b^4</span>-1= (a^3b^2)^2-1^2= (a^3b^2-1)(a^3b^2+1).
66/7*(9/33-107/33)=66/7*(-98/33)= -28
Tgx=√3
x=π/3+πn,n∈z
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