Ответ:
можно их разделить в группу по 3человека
Объяснение:
или по четыре
Tg x = lg 2 + lg 5 = lg (2*5);
Tg x = lg 10 = 1;
X = Π/4 + Π*k
1)(x-y)+b(y-x)=-(y-x)+
<span>b(y-x)= (y-x)(b-1)</span><span>
2)2b(x-y)-(y-x)= </span><span>2b(x-y)+(x-y)= (x-y)(2b+1)</span><span>
3)a(b-c)+x(b-c)-7(b-c)= </span><span>(b-c)(a+x-7)</span><span>
4)x(a-2)+y(2-a)-(2-a)= </span><span>x(a-2)-y(a-2)+(a-2)= (a-2)(x-y+1)</span><span>
5)3(x+y)(x-y)-(x+y)</span>²<span>=</span><span>(x+y)(3(x-y)</span><span>-(x+y))</span><span>= (x+y)(3x-3y –x-y) = 2(x+y)(x-y)</span><span>
6)3m(n-m)</span>²<span>-9m</span>²<span>(m-n)= </span><span>(m-n)(</span><span>3m(n-m)-</span><span>9m</span>²<span>)= (m-n)( 3mn-3m</span>²<span>- 9m</span>²<span>)= 3m(m-n)( n-4m)</span>