初一数学题~!20悬赏
来源:百度知道 编辑:UC知道 时间:2024/05/28 10:03:48
(a+b+3)(a+b-3)
(x+1)^2(x-1)^2
(x+1)^2(x-1)^2
(a+b+3)(a+b-3)
=(a+b)^2-9
=a^2+2ab+b^2-9
(x+1)^2(x-1)^2
=(x^2-1)^2
=x^4-2x^2+1
(a+b+3)(a+b-3)
=(a+b)^2-2(a+b)*3+3^2
=(a+b)^2-6a-6b+9
=a^2+b^2+2ab-6a-6b+9
(x+1)^2(x-1)^2
=((x+1)(x-1))^2
=(x^2-1)^2
=x^4-2x^2+1
a^2+2ab+b^2
x^a-2x^2+1
好好学习!这样的题都不会
(a+b+3)(a+b-3)
=(a+b)^2-9
=a^2+2ab+b^2-9
(x+1)^2(x-1)^2
=(x^2-1)^2
=x^4-2x^2+1
1)
a^2+ba+3a+ba+b^2-3b+3a+3b-9=a^2+2ab+b^2-9
2)=(x^2-1)^2
=x^4-2x^2+1我是第一个回答的,一修改沉低了!选我!!!!!!!!!!!!!!!!!!!!!