1) =3ac+3bc-ad-bd
2)5x^3-2xy-15x^2y^2+6y^3
3)6a^2-21b^2
4)(4x^2-6x+1)(2x+3-8x^3)=-32х^2+48х^4-16х+3
5)(3y-2)(5y+3)-(2y+1)(7y-2)=-4
15у^2-10у+9у-6-14у^2-7у+4у+2=-4
у^2-4у=0
у(у-4)=0
у=0 и у=4
6)y^2(y^2-4y+6)(y+4)=у^5-10у^3+24у^2
1)(x+y-z)-1=x+y-z-1
2)<span>x+(y-x)=x+y-x=y
3)(x+y)-(x-y)=x+y-x+y=2y
4)</span><span>(x+y)-(x-y)=x+y-x+y=2y
5)</span>(x-y+z)-(x+y-z)=<span>x-y+z-x-y+z=-2y+2z
6)(а+в-с)+2=</span><span>а+в-с+2
7)а+(в-с)=а+в-с
8)а-(а-в+с)=а-а+в-с=в-с
9)(х+у)-(х-у)=х+у-х+у=2у
10)(а-в+1)-(а+в-1)=</span>а-в+1-<span>а-в+1=-2в+2
</span>11)(m+p-q)-p=m+p-q-p=<span>m-q
</span><span>12)m+(p-m)=m+p-m=p
13)m-(m-p+q)=m-m+p-q=p-q
14)(p+q)-(p-q)=p+q-p+q=2q
15)(m-p+5)-(m+p-3)=</span><span>m-p+5-m-p+3=-2p+8</span><span>
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