1.利用因式分解计算:87²+87×26+13²2.在实数范围内分解下列因式(1)16a²-5(2)x²+2√2+2(3)7x²-1(4)x^4-4x²+43.已知a-b=2√3-1,ab=√3,则(a+1)(b-1)的值为( )A.√3 B.3√3 C.√
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![1.利用因式分解计算:87²+87×26+13²2.在实数范围内分解下列因式(1)16a²-5(2)x²+2√2+2(3)7x²-1(4)x^4-4x²+43.已知a-b=2√3-1,ab=√3,则(a+1)(b-1)的值为( )A.√3 B.3√3 C.√](/uploads/image/z/442003-67-3.jpg?t=1.%E5%88%A9%E7%94%A8%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E8%AE%A1%E7%AE%97%EF%BC%9A87%26%23178%3B%2B87%C3%9726%2B13%26%23178%3B2.%E5%9C%A8%E5%AE%9E%E6%95%B0%E8%8C%83%E5%9B%B4%E5%86%85%E5%88%86%E8%A7%A3%E4%B8%8B%E5%88%97%E5%9B%A0%E5%BC%8F%EF%BC%881%EF%BC%8916a%26%23178%3B-5%EF%BC%882%EF%BC%89x%26%23178%3B%2B2%E2%88%9A2%2B2%EF%BC%883%EF%BC%897x%26%23178%3B-1%EF%BC%884%EF%BC%89x%5E4-4x%26%23178%3B%2B43.%E5%B7%B2%E7%9F%A5a-b%3D2%E2%88%9A3-1%2Cab%3D%E2%88%9A3%2C%E5%88%99%EF%BC%88a%2B1%EF%BC%89%28b-1%29%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88+%EF%BC%89A.%E2%88%9A3+B.3%E2%88%9A3+C.%E2%88%9A)
1.利用因式分解计算:87²+87×26+13²2.在实数范围内分解下列因式(1)16a²-5(2)x²+2√2+2(3)7x²-1(4)x^4-4x²+43.已知a-b=2√3-1,ab=√3,则(a+1)(b-1)的值为( )A.√3 B.3√3 C.√
1.利用因式分解计算:87²+87×26+13²
2.
在实数范围内分解下列因式
(1)16a²-5
(2)x²+2√2+2
(3)7x²-1
(4)x^4-4x²+4
3.
已知a-b=2√3-1,ab=√3,则(a+1)(b-1)的值为( )
A.√3 B.3√3 C.√4/3 D.-√75
1.利用因式分解计算:87²+87×26+13²2.在实数范围内分解下列因式(1)16a²-5(2)x²+2√2+2(3)7x²-1(4)x^4-4x²+43.已知a-b=2√3-1,ab=√3,则(a+1)(b-1)的值为( )A.√3 B.3√3 C.√
87²+87×26+13²=(87+13)²=10000
(1)16a²-5= (4a-√5)(4a+√5)
(2)x²+2√2x+2=(x+√2)²
(3)7x²-1=(x√7-1)(x√7+1)
(4)x^4-4x²+4=(x²-2)²=[(x-√2)(x+√2)]²
(a+1)(b-1)=ab-a+b-1=ab-(a-b)-1=√3-2√3+1-1=-√3
如前面同志的解答。
1 87²+87*26+13²=(87+13)²=100²=10000
2 16a²-5=(4a-√5)(4a+√5)
x²+2√2+2=(x+√2)²
7x²-1=(√7x-1)(√7x+1)
x^4-4x²+4=(x...
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1 87²+87*26+13²=(87+13)²=100²=10000
2 16a²-5=(4a-√5)(4a+√5)
x²+2√2+2=(x+√2)²
7x²-1=(√7x-1)(√7x+1)
x^4-4x²+4=(x²-2)²=(x-√2)²(x+√2)²
3 (a+1)(b-1)=ab-a+b-1=ab-(a-b)-1=√3-2√3+1-1= -√3 (这个题是不是给错了)
收起
1) (4a+√5)(4a-√5)
2)(x+√2)²
3)(√7x+1)(√7x-1)
4)(x+√2)²(x-√2)²
来晚了,大家都答出来了