(a+1)^2-2(a+1)(a-1)+3(a-1)^2
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/13 00:06:39
(a+1)^2-2(a+1)(a-1)+3(a-1)^2
(a+1)^2-2(a+1)(a-1)+3(a-1)^2(过程要带啊),老师叫我讲,正确的
(a+1)^2-2(a+1)(a-1)+3(a-1)^2(过程要带啊),老师叫我讲,正确的
直接解(a+1)^2-2(a+1)(a-1)+3(a-1)^2
=a^2+2a+1-2a^2+2+3a^2-6a+3
=2a^2-4a+6
较简便的(a+1)^2-2(a+1)(a-1)+3(a-1)^2
=[(a+1)-(a-1)]^2+2(a-1)^2
=4+2a^2-4a+2
=2a^2-4a+6
我本助人为乐而解,这里省了几步,我一般都会这样写,不知你能看懂吗
=a^2+2a+1-2a^2+2+3a^2-6a+3
=2a^2-4a+6
较简便的(a+1)^2-2(a+1)(a-1)+3(a-1)^2
=[(a+1)-(a-1)]^2+2(a-1)^2
=4+2a^2-4a+2
=2a^2-4a+6
我本助人为乐而解,这里省了几步,我一般都会这样写,不知你能看懂吗
(a 1)(a 2)(a 3)(a
a(a-1)(a-2)(a-3)(a-4)因式分解
【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a-a a=[ ] [4]a-a=a+a
(高一集合)已知A={2,4,a*a*a-2a*a-a+7},B={1,a+3,a*a-2a+2,a*a*a+a*a+3
(a+1)(a+2)(a-3)计算
1A,2A,3A...
a/a-1÷(a-a/2a-1)
求和:1,a+a^2,a^3+a^4+a^5,a^6+a^7+a^8+a^9,···(a不等于0)
1+a^1+a^2+a^3+.+a^n=?
计算a^3/a-1-a^2-a-1
已知 a>1,求证a^3>a+1/a-2
化简a(a+2)-(a-1)(a+1)