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>
Log(√3)27=log(√3)(√3)^6=6
2.cos x = odm.3
cos x = odm.3/2
x = pí/6 + 2k.pí i tože x = 11pí/6 + 2k.pí
b2-9a2-2b+6a=(b-3a)(b+3a)-2(b+3a)=(b+3a)(b+3a-2)
Надо сначала свернуть его (x(в квадрате) - 3x)-(3у - у(в квадрате) ) потом
выносим общий множитель x(3-x) - y(3-y)