Question

简便计算 急急急！

1、2003*200220022002-2002*200320032003
2、1120*122112211221-1221*112011201120
3、1234*432143214321-4321*123412341234
4、2002*30033003-3003*40044004

Answer 1

1、2003*200220022002-2002*200320032003
=2003*2002*100010001-2002*2003*100010001
=0
2、1120*122112211221-1221*112011201120
=1120*1221*100010001-1221*1120*100010001
=0
3、1234*432143214321-4321*123412341234
=1234*4321*100010001-4321*1234*100010001
=0
4、2002*30033003-3003*40044004
=2002*3003*10001-3003*2*2002*10001
=（1-2）*2002*3003*10001
=-2002*30033003

Answer 2

2003*200220022002-2002*200320032003=2002×100010001×2003-2002*200320032003=2002×200320032003=0