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(1+0.97+0.215)×(0.97+0.215+0.567)-(1+0.97+0.215+0.567)×(0.97

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(1+0.97+0.215)×(0.97+0.215+0.567)-(1+0.97+0.215+0.567)×(0.97+0.215)
求这道题的简便运算?
还有1题目求简便运算,如下;
2004×2004+2003×2003-2004×2003-2003×2002
(1+0.97+0.215)×(0.97+0.215+0.567)-(1+0.97+0.215+0.567)×(0.97
(1+0.97+0.215)*(0.97+0.215+0.567)-(1+0.97+0.215+0.567)*(0.97+0.215)=(0.97+0.215)*(0.97+0.215+0.567)+1*(0.97+0.215+0.567)-(0.97+0.215+0.567)*(0.97+0.215)-1*(0.97+0.215)=(1-0.97-0.215)*(0.97+0.215+0.567)+(0.97+0.215-1)*(0.97+0.218+0.567)=0
2004*2004+2003*2003-2004*2003-2003*2002
=2004*2004-2004*2003+2003*2003-2003*2002
=2004*(2004-2003)+2003*(2003-2002)
=2004*1+2003*1
=2004+2003
=4007
再问: 第1题错的吧
再答: (1+0.97+0.215)x(0.97+0.215+0.567)
-(1+0.97+0.125+0.567)x(0.97+0.215)
=1x(0.97+0.215+0.567)+(0.97+0.215)x(0.97+0.215+0.567)
-1x(0.97+0.215)-(0.97+0.125+0.567)x(0.97+0.215)
=0.97+0.215+0.567-0.97-0.215
=0.567
应该是0.567