(5x - 3) : 36 = 3 : 4
4 (5x - 3) = 3 * 36
4 (5x - 3) = 108
20x - 12 = 108
20x = 108 + 12
20x = 120
x = 6
А) 5(a^2 - 2ab+b^2)=5a^2-10ab+5b^2
б) 2 (m^2 - 3m+3)=2m^2-6m+6<span><span>
</span><span>в) -3 (x^2 +xy
+y^2)=-3x^2-3xy-3y^2</span><span>
</span><span>г<span>) -4(1-2n^2
-3n^3)=-4+8n^2+12n^3
</span></span></span>а) 3n^2– n (4n – 6m)=3n^2-4n^2+6nm=-n^2+6nm
б) 5а + 2а (3а – 2)=5a+6a^2-4a=a+6a^2
A1. Б
A2. В
A3. Б
A4. А
A5. В
формула вроде V<em>=</em>H<var /> (в кубе) т.е. 20*20*20