2(x+1)²-5(x+1)(x-1)+3(x-1)² 计算 四个问题求解答不是连一起的(2013+a)(2012+a)=100,求(2013+a)²+(2012+a)²=a-b=3,a-c=二分之一,则(b-c)²-3(b-c)+四分之九=a+b=5 ,ab=6 ,则a²+b²
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![2(x+1)²-5(x+1)(x-1)+3(x-1)² 计算 四个问题求解答不是连一起的(2013+a)(2012+a)=100,求(2013+a)²+(2012+a)²=a-b=3,a-c=二分之一,则(b-c)²-3(b-c)+四分之九=a+b=5 ,ab=6 ,则a²+b²](/uploads/image/z/8683476-60-6.jpg?t=2%28x%2B1%29%26%23178%3B-5%28x%2B1%29%28x-1%29%2B3%28x-1%29%26%23178%3B+%E8%AE%A1%E7%AE%97+%E5%9B%9B%E4%B8%AA%E9%97%AE%E9%A2%98%E6%B1%82%E8%A7%A3%E7%AD%94%E4%B8%8D%E6%98%AF%E8%BF%9E%E4%B8%80%E8%B5%B7%E7%9A%84%EF%BC%882013%2Ba%EF%BC%89%EF%BC%882012%2Ba%EF%BC%89%3D100%2C%E6%B1%82%EF%BC%882013%2Ba%EF%BC%89%26%23178%3B%2B%EF%BC%882012%2Ba%EF%BC%89%26%23178%3B%3Da-b%3D3%2Ca-c%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%2C%E5%88%99%EF%BC%88b-c%EF%BC%89%26%23178%3B-3%EF%BC%88b-c%EF%BC%89%2B%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B9%9D%3Da%2Bb%3D5+%2Cab%3D6+%2C%E5%88%99a%26%23178%3B%2Bb%26%23178)
2(x+1)²-5(x+1)(x-1)+3(x-1)² 计算 四个问题求解答不是连一起的(2013+a)(2012+a)=100,求(2013+a)²+(2012+a)²=a-b=3,a-c=二分之一,则(b-c)²-3(b-c)+四分之九=a+b=5 ,ab=6 ,则a²+b²
2(x+1)²-5(x+1)(x-1)+3(x-1)² 计算 四个问题求解答不是连一起的
(2013+a)(2012+a)=100,求(2013+a)²+(2012+a)²=
a-b=3,a-c=二分之一,则(b-c)²-3(b-c)+四分之九=
a+b=5 ,ab=6 ,则a²+b²=————,a四次方+b的四次方=————
2(x+1)²-5(x+1)(x-1)+3(x-1)² 计算 四个问题求解答不是连一起的(2013+a)(2012+a)=100,求(2013+a)²+(2012+a)²=a-b=3,a-c=二分之一,则(b-c)²-3(b-c)+四分之九=a+b=5 ,ab=6 ,则a²+b²
2(x+1)²-5(x+1)(x-1)+3(x-1)²
=[2(x+1)-3(x-1)][(x+1)-(x-1)]
=2(-x+5)
=-2(x-5)
(2013+a)²+(2012+a)²=
=(2013+a-2012-a)²+2(2013+a)(2012+a)
=2×100
=200
∵a-b=3,a-c=1/2
∴b-c=-5/2
则(b-c)²-3(b-c)+9/4
=(-5/2)²-3×(-5/2)+9/4
=25/4+30/4+9/4
=64/4
=16
a+b=5 ,ab=6 ,
a²+b²=(a+b)²-2ab
=5²-2×6
=25-12
=13
a⁴+b⁴=(a²+b²)²-2(ab)²
=13²-2×6²
=169-72
=97