А) 14, 21, 42, 63
б) 51,68
в) 14, 21, 31, 42, 51, 63, 68, 75
г) 21, 31, 51, 63, 75
23х+х-35=997
23х+х=997+35
24х=1032
х=1032÷24
х=43
1
(0,45-1,45)(0,45²+0,45*1,45+1,45²)-0,45*1,45=
=-1*(0,45²+0,45*1,45+1,45²)-0,45*1,45=
=-1*(0,45²+0,45*1,45+1,45²+0,45*1,45)=
=-1*(0,45²+2*0,45*1,45+1,45²)=-(0,45+1,45)²=-1,9²=-3,61
2
(0,507+0,493)(0,507²-0,507*0,493+0,496²)-0,507*0,493=
=1*(0,507²-0,507*0,493+0,496²)-0,507*0,493=
=0,507²-0,507*0,493+0,496²-0,507*0,493=
=0,507²-2*0,507*0,493+0,496²=(0,507-0,493)²=0,014²=0,00000196