2a(x+y)-(x+y)=
a^2(x-1)-b(1-x)=
(-2u-z)+3k(z+2u)=
x+y-(x+y)^2=
(a+b)^3-a(a+b)^2=
x^2-2y dla x=-2,1 y=1/2
3(a-b)-(2a-b)+1= dla a=1/4 , b=-2
(4a-8)+(-7a+5)=
-3a(4a-2b+1)=
(6a-7)-(9a-2)=
(2a+4)(3a-5)=
(3x+y)(-x-y)(2x+1)=
*** 4a(x-y)-(x+y)*2a-(x-a)(2a-y)=
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2a(x+y)-(x+y)=2ax+2ay-x-y
a^2(x-1)-b(1-x)=a²x-a²-b+bx
(-2u-z)+3k(z+2u)=-2u-z+3kz+6ku
x+y-(x+y)^2=x+y-(x+y)(x+y)=x+y-(x²+xy+xy+y²)=x+y-x²-xy-xy-y²=-x²-y²-2xy+x+y
(a+b)^3-a(a+b)^2=(a+b)(a+b)(a+b)-a[(a+b)(a+b)]=
a²+ab+a²+ab+ab+b²+ab+b²-a(a²+ab+ab+b²)=
2a²+2b²+4ab-a³-a²b-a²b-ab²=
2a²+2b²+4ab-a³-2a²b-ab²
x^2-2y dla x=-2,1 y=1/2
x²-2y
(-2.1)²-2*1/2
4.41-1=3.41
3(a-b)-(2a-b)+1= dla a=1/4 , b=-2
3(1/4-(-2))-(2*1/4-(-2))+1
3/4-(-6)-(2/4+2)+1=
3/4+6-2/4-2+1=
3/4-2/4+5=5 1/4=5.25
(4a-8)+(-7a+5)=
4a-8-7a+5=-3a-3
-3a(4a-2b+1)=12a²+6ab-3a
(6a-7)-(9a-2)=6a-7-9a+2=-3a-5
(2a+4)(3a-5)=6a²-10a+12a-20=6a²+2a-20
(3x+y)(-x-y)(2x+1)=-3x²-3xy-6x²+3x-xy-y²+2xy+y=-9x²-y²-2xy+3x+y
*** 4a(x-y)-(x+y)*2a-(x-a)(2a-y)=4ax-4ay-2ax+2ay-(2ax-xy-2a²+ay)=
4ax-4ay-2ax+2ay-2ax+xy+2a²-ay=2a²-ay+xy