А) 0,45³-1,45³-0,45*1,45=(0,45-1,45)(0,45²+0,45*1,45+1,45²)-0,45*1,45=
=-(0,45²+0,45*1,45+1,45²)-0,45*1,45=-0,45²-0,45*1,45-1,45²-0,45*1,45=
=-0,45²-2*0,45*1,45-1,45²=-(0,45²+2*0,45*1,45+1,45²)=
= -(0,45+1,45)²=-1,9²=-3,61
б) 0,507³+0,493³-0,507*0,493=(0,507+0,493)(0,507²-0,507*0,493+0,493²)-0,507*0,493=0,507²-0,507*0,493+0,493²-0,507*0,493=0,507²-2*0,507*0,493+0,493²=(0,507-0,493)²=0,014²=0,000196