X³y²-x³-xy²+x=xy²(x²-1)-x(x²-1)=(xy²-x)-(x²-1)=x(y²-1)-(x-1)(x+1)=x(y-1)(y+1)-(x-1)(x+1)
1.) х^2+2х-80=0
x^2+10x-8x-80=0
x(x+10)-8(x+10)=0
(x+10)*(x-8)=0
x+10=0
x-8=0
x=-10
x=8
2.) 5t^2+26t-24=0
5t^2+30t-4t-24=0
5t(t+6)-4(t+6)=0
(t+6)*(5t-4)=0
t+6=0
5t-4=0
t=-6
t=4/5
(- 3/4) - (36*2)/4 = -3/4 - 18 = -0,75-18= -18,75
35^9 * 7^10 7^9 * 5^9 * 7^10 7^19 * 5^9
---------------- = ---------------------------- = ------------------- = 7^19 * 5
25^4 5^8 5^8