(1).(2m+3)(2m-3)(2).x(x+1)+(2-x)(2+x)(3).(3x-y)(3x+y)+y(x+y)(4).(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)用平方差公式计算:(1).1007993(2).108112

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(1).(2m+3)(2m-3)(2).x(x+1)+(2-x)(2+x)(3).(3x-y)(3x+y)+y(x+y)(4).(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)用平方差公

(1).(2m+3)(2m-3)(2).x(x+1)+(2-x)(2+x)(3).(3x-y)(3x+y)+y(x+y)(4).(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)用平方差公式计算:(1).1007*993(2).108*112
(1).(2m+3)(2m-3)
(2).x(x+1)+(2-x)(2+x)
(3).(3x-y)(3x+y)+y(x+y)
(4).(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)
用平方差公式计算:
(1).1007*993
(2).108*112

(1).(2m+3)(2m-3)(2).x(x+1)+(2-x)(2+x)(3).(3x-y)(3x+y)+y(x+y)(4).(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)用平方差公式计算:(1).1007*993(2).108*112
(1).(2m+3)(2m-3)
用平方差
=4m^2-9
(2).x(x+1)+(2-x)(2+x)
=x^2+x+4-x^2
=x+4
(3).(3x-y)(3x+y)+y(x+y)
=9x^2-y^2+xy+y^2
=9x^2+xy
(4).(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)
=a^2-1/4b^2-(9a^2-4b^2)
=a^2-1/4b^2-9a^2+4b^2
=-8a^2+15/4b^2
用平方差公式计算:
(1).1007*993
=(1000+7)*(1000-7)
=1000^2-7^2
=1000000-49
=999951
(2).108*112
=(110-2)*(110+2)
=110^2-2^2
=12100-4
=12096

已知m＞4,化简|m-4|+|7-2m|+|m×m-2m+1|-|m×m-2m-3| m(m+1)(m+2)(m+3)+1? 1/m(m+1)+1/(m+1)(m+2)+1/(m+2)(m+3)+.+1/(m+9)(m+10) 计算：（m+3m+5m+...+2009m)-(2m+4m+6m+...+2008m) (m+3m+5m+...+2009m)-(2m+4m+6m+...2008m) (m+3m+5m+...+2014m)-(2m+4m+6m+...+2013m) (m+3m+5m+...+2013m)-(2m+4m+6m+...+2012m) (m+3m+5m+...+2015m)-(2m+4m+6m+...+2014m)= 计算:(m+3m+5m+...+2009m)-(2m+4m+6m+...+2010m) m-2m-3m+4m-5m-6m+7m.2004m=? (m+3m+5m.+2013m)-(2m+4m+6m+.+2012m)=? m^2+m-6/m^2+2m+1÷m+3/m^+m·m^2-1/2-m 其中m=-1/2 m-2m-3m+4m-5m-6m+7m-8m-9m+...+2002m-2003m-2004m求m的值化简,:3(m-1)^2+(m+2)(m^2-2m+4)-m(m^2+3m-3) (m+m^-1+2)/(m^-1/2+m^1/2)*(m^-2/3-m3/2)/(m+m^-1+1) 已知m>4,化简:|m-4|+|7-2m|+|m^2-2m+1|-|m^2-2m-3| 计算2m+6/m²-4m+4·1/m+3·（m-2)(m+3)/m+3 (m-3)/(m平方-1)÷(m平方-3m)/(m平方+2m+1)-1/m-1