20022003×20032002-20022002×20032003
=20022002*20032002-20022002*20032003+20032002
=20022002(20032002-20032003)+20032002
=10000
8457×8457-8456×8458
=8458*8457-8457-8458*8456
=8458-8457=1
99.9+0.2+0.9+9.9+0.2+999.9
=100+1+10+1000
=1111
(2002-2.002)÷(4004-4.004)
=2(1001-1.001)÷4(1001-1.001)
=0.5
1.999×3.14+199.9×31.4-19.99×314
=3.14*1.999+3.14*1999-3.14*1999
=3.14*1.999=6.27686
1999+999×999
=999+1000+999*999
=999000+1000
=1000000
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