1.(ab+1)^2-(ab-1)^22.(3mn+1)(3mn-1)-8m^2n^23.(x+2)^2-(x+5)(x-1)4.(x-2)^2-2(x+1)(x-1)5.(x+2)^2-(3x+1)(x-1)6.(-2a+10b)(2a+10b)
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/29 05:18:55
1.(ab+1)^2-(ab-1)^22.(3mn+1)(3mn-1)-8m^2n^23.(x+2)^2-(x+5)(x-1)4.(x-2)^2-2(x+1)(x-1)5.(x+2)^2-(3x+1)(x-1)6.(-2a+10b)(2a+10b)
1.(ab+1)^2-(ab-1)^2
2.(3mn+1)(3mn-1)-8m^2n^2
3.(x+2)^2-(x+5)(x-1)
4.(x-2)^2-2(x+1)(x-1)
5.(x+2)^2-(3x+1)(x-1)
6.(-2a+10b)(2a+10b)
1.(ab+1)^2-(ab-1)^22.(3mn+1)(3mn-1)-8m^2n^23.(x+2)^2-(x+5)(x-1)4.(x-2)^2-2(x+1)(x-1)5.(x+2)^2-(3x+1)(x-1)6.(-2a+10b)(2a+10b)
1.(ab+1)^2-(ab-1)^2
=(ab+1+ab-1)(ab+1-ab+1)=4ab
2.(3mn+1)(3mn-1)-8m^2n^2
=9m^2n^2-1-8m^2n^2
=m^2n^2-1
3.(x+2)^2-(x+5)(x-1)
=x^2+4x+4-x^2-4x+5
=9
4.(x-2)^2-2(x+1)(x-1)
=x^2-4x+4-2x^2+1
=-x^2-4x+5
=(x+5)(1-x)
5.(x+2)^2-(3x+1)(x-1)
=x^2+4x+4-3x^2+2x+1
=-2x^2+6x+5
6.(-2a+10b)(2a+10b)
=100b^2-4a^2
1.(ab+1)^2-(ab-1)^2
=(ab+1+ab-1)(ab+1-ab+1)
=2ab*2
=4ab
2.(3mn+1)(3mn-1)-8m^2n^2
=9m^2n^2-1-8m^2n^2
=m^2n^2-1
3. 分太少.
1、原式=(ab+1+ab-1)*(ab+1-ab+1)=2ab
2、=9m^2n^2-1-8m^2n^2=m^2n^2-1
都是用公式好吧,回去慢慢算阿!
1=aabb+1+2ab-aabb-1+2ab=4ab
2=9mmnn-1-8mmnn=mmnn-1
3=xx+4+4x-xx+4x-5=8x-1
4=xx+4-4x--2xx+2=-xx-4x+6
5=xx+4x+4-3xx+2x-1=-2xx+6x+3
6=(10b-2a)(10b+2a)=100bb-4aa