作业帮几道中学数学题,☆答对加10分一道☆
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几道中学数学题,☆答对加10分一道☆
(1+1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)-(1+1/1997+1/1999+1/2001+1/2003)*(1/1997+1/1999+1/2001)
已知|a|=-a,b
(1+1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)-(1+1/1997+1/1999+1/2001+1/2003)*(1/1997+1/1999+1/2001)
已知|a|=-a,b
1、
(1+1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)-(1+1/1997+1/1999+1/2001+1/2003)*(1/1997+1/1999+1/2001)
用乘法分配率
=[(1/1997+1/1999+1/2001+1/2003)+(1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)]-[(1/1997+1/1999+1/2001)+(1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)]
=(1/1997+1/1999+1/2001+1/2003)+(1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)-(1/1997+1/1999+1/2001)-(1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)
=(1/1997+1/1999+1/2001+1/2003)-(1/1997+1/1999+1/2001)
=1/1997+1/1999+1/2001+1/2003-1/1997-1/1999-1/2001
=1/2003
2、因为|a|=-a,所以a≤0,又
(1+1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)-(1+1/1997+1/1999+1/2001+1/2003)*(1/1997+1/1999+1/2001)
用乘法分配率
=[(1/1997+1/1999+1/2001+1/2003)+(1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)]-[(1/1997+1/1999+1/2001)+(1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)]
=(1/1997+1/1999+1/2001+1/2003)+(1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)-(1/1997+1/1999+1/2001)-(1/1997+1/1999+1/2001)*(1/1997+1/1999+1/2001+1/2003)
=(1/1997+1/1999+1/2001+1/2003)-(1/1997+1/1999+1/2001)
=1/1997+1/1999+1/2001+1/2003-1/1997-1/1999-1/2001
=1/2003
2、因为|a|=-a,所以a≤0,又
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