429
1) (х+2)(х²-2х+4)-х(х-3)(х+3) = х³+2³ - х(х²-3²) = х³+8-х³+9х = 8+9х
8+9х = 8+9*2 = 8+18=26
2) (2х-1)(4х²+2х+1)-4х(2х²-3) = (2х)³-1³ -8х³+12х = 8х³-1-8х³+12х = -1+12х
-1+12х = -1+12*0,5 = -1+6 = 5
3) (4х+1)(16х²-4х+1)-16х(4х²-5) = (4х)³+1³-64х³+80х = 64х³+1-64х³+80х = 1+80х
1+80х = 1+80 * 1/5 = 1+16=17
4) х(х+2)(х-2)-(х-3)(х²+3х+9) = х(х²-2²)-(х³-3³) = х³-4х-х³+27 = -4х+27
-4х+27 = -4 * 1/4 + 27 = -1+27 = 26