Uprość wyrażenia : -(2x^{2}+xy-2x)-(-3x^{2}+2xy)-x=
(-5x^{2}+3x)-(2x-x^{2})=
2(a+b)+(-4a-2b)=
3(x+y-a)-5(2y-x+a)=
9x-15/3 + 8x-4/-2=
20x^{2} -4x+1/4= -2 pierwiastka z 3 (a+pierwiastek z 3x)
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1) ...=-2x-xy+2x+3x²-2xy-x=3x²-x-3xy
2)...=-5x²+3x-2x+x²=-4x²+x
3)...=2a+2b-4a-2b=-2a
4)...=3x+3y-3a -10y+5x-5a=8x-7y-8a
5)...=(9x-15)/3+(8x-4)/-2=
=3x-5 -4x+2=-x-3
lub:
...= 9x -15/3 + 8x -4/-2=
=9x-5 +8x+2=17x+7
6) 20x²-4x+1/4 =-2√3a - 6x
= 20x²-4x+1/4+2√3a+6x
=20x²+2x+1/4+2√3a
=2(10x²+x+1/8 +√3a)