(1) (2m+3)(2m-3)
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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+二分之一b)(a-二分之一b)-(3a-2b)(3a+2b)
(2) x(x+1)+(2-x)(2+x)
(3) (3x-y)(3x+y)+y(x+y)
(4) (a+二分之一b)(a-二分之一b)-(3a-2b)(3a+2b)
(1) (2m+3)(2m-3)=4m²-9
(2) x(x+1)+(2-x)(2+x)=x+4
(3) (3x-y)(3x+y)+y(x+y)=9x²-y²+xy+y²=9x²+xy
(4) (a+二分之一b)(a-二分之一b)-(3a-2b)(3a+2b)
=a²-b²/4-(9a²-4b²)=-8a²+(15/4)b²
(2) x(x+1)+(2-x)(2+x)=x+4
(3) (3x-y)(3x+y)+y(x+y)=9x²-y²+xy+y²=9x²+xy
(4) (a+二分之一b)(a-二分之一b)-(3a-2b)(3a+2b)
=a²-b²/4-(9a²-4b²)=-8a²+(15/4)b²
已知m>4,化简|m-4|+|7-2m|+|m×m-2m+1|-|m×m-2m-3|
(1m+3m+5m+...+2009m)-(2m+4m+6m+...=2008m)
计算:(m+3m+5m+…+2015m)-(2m+4m+6m+…+2014m)=
(m²-2m+1/m²-1+m²-m/m)÷(1+m/2,其中m=-3)
(m+3m+5m+.+2008m)-(2m+4m+6m+.+2009m)
(m+3m+5m+...+2009m)-(2m+4m+6m+...2008m)
m-2m-3m+4m-5m-6m+7m.2004m=?
计算:(m+3m+5m+...+2009m)-(2m+4m+6m+...+2010m)
(m+3m+5m+...+2013m)-(2m+4m+6m+...+2012m)
(m+3m+5m.+2013m)-(2m+4m+6m+.+2012m)=?
(m+3m+5m+...+2014m)-(2m+4m+6m+...+2013m)
(m+3m+5m+...+2015m)-(2m+4m+6m+...+2014m)=