(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

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/20 01:53:01
(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
xRn@~VxiB7ϑJREž!E)jZHmզnpȡuS^Y;DZ#>|fvp@J2@9ġ\.EIaըK"eXFVlY#EQM˛/7Ⓦz8=MiПE>N^j,G}J+bw ,w,R5/|}K*{ɻuOⰛ Φdgq=v0wpkkk ڜE/I5 {%trUIlG8 R~#-+X%1ZXJZfT/(j0+]r*jVX@-ؠe V]:AiU5jBi`U:_\b {TV1Kmk>#3wAy1p#xo5F:ʫa n7+wGO2

(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..