[2*(3²+5³-13)+3*17-23]*10³
= [2(9+5³-13)+51-23)*10³=
= [2(-4+5³)+51-23)*10³=
= (-8+2*5³+51-23)*10³=
= -8*10³+2*50^3 +51*10^3-23*10^3=
= 20*10³+2*50^3=
= (20+2*5^3)*10^3=
= (20+2*125)*1000=
= (20+250)*1000=
= 270*1000=
=270000
