2)a)402+127=529
529x43=22747
B)402-127=275
275x43=11825
C)22747+11825=34572
34572+43=34615
3)a=(32+63)+19
A=95+19
A=114
B=(42+21):9+32
B=63:9+32
B=7+32
B=39
Axb=114x39=4446
4)a)4x19=76
4x20=80
{77,78,79}
B)11x125=1375
11x126=1386
{1376,1377,1378,1379,1380,1381,1382,1383,1384,1385}
5)35x(20+20-20-20)+1=35x0+1=0+1=1
459x(15+15-15+1)=459x16=7344