(1)(2m+3)(2m-2)
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/12 17:14:53
(1)(2m+3)(2m-2)
(2)x(x+1)+(2-x)(2+x)
(3)(3x-y)(3x+y)+y(x+y)
(4)(a+b)(a-½b)-(3a-2b)(3a+2b)
用平房差公式进行计算:
(1)1007×993 (2)108×112
(2)x(x+1)+(2-x)(2+x)
(3)(3x-y)(3x+y)+y(x+y)
(4)(a+b)(a-½b)-(3a-2b)(3a+2b)
用平房差公式进行计算:
(1)1007×993 (2)108×112
小朋友:
你下面的问题主要是利用平方差公式:X2-Y2=(X+Y)(X-Y)
记下来这些题你都会做的
(2m+3)(2m-2)=4m2+6m-4m-6=4m2+2m-6
x(x+1)+(2-x)(2+x)=x2+x+4-x2=x+4
(3x-y)(3x+y)+y(x+y)=9x2-y2+xy+y2=9x2+xy
(a+b)(a-½b)-(3a-2b)(3a+2b)=a2+ab-1/2b2-1/2ab= a2+1/2ab-1/2b2
(1)1007×993=(1000+7)(1000-7)=10002-72=999951
(2)108×112=(110+2)(110-2)=1102-22=12096
你下面的问题主要是利用平方差公式:X2-Y2=(X+Y)(X-Y)
记下来这些题你都会做的
(2m+3)(2m-2)=4m2+6m-4m-6=4m2+2m-6
x(x+1)+(2-x)(2+x)=x2+x+4-x2=x+4
(3x-y)(3x+y)+y(x+y)=9x2-y2+xy+y2=9x2+xy
(a+b)(a-½b)-(3a-2b)(3a+2b)=a2+ab-1/2b2-1/2ab= a2+1/2ab-1/2b2
(1)1007×993=(1000+7)(1000-7)=10002-72=999951
(2)108×112=(110+2)(110-2)=1102-22=12096
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)
化简2[(m-1)m+m(m+1)]乘【(m-1)m-m(m+1))
(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)=
化简,:3(m-1)^2+(m+2)(m^2-2m+4)-m(m^2+3m-3)