(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
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(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
(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
(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
(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
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
你好大哦,太难了,我不会我还上小学耶,帮不了耶!
你上初中吧..
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