1.
2x - 3y-(2y - 3x)=2x-3y-2y+3x=5x-5y
2y - 3x-(2x - 3y)=2y-3x-2x+3y=5y-5x
2x + 3y-(2x - 3y)= 2x+3y-2x+3y=6y
2y - 3x-(2x - 3y+2x + 3y)=2y-3x-4x=2y-7x
2x - 3y-(2x + 3y-(2y - 3x))=2x-3y-(2x+3y-2y+3x)=2x-3y-5x-y=-3x-4y
2.
4a(5b-2a)=20ab-8a2
⅓t²(3+½t³)=t²+1/6t5
5a(5a²-0,2)=25a³-a
(12x²y+3xy²) : 6= 2x²y+½xy²
(4y-6x) :(-2)=-2y+3x
(½t⁴ - ⅗w⁴) : 3 = 1/6t⁴ -⅕w⁴