与二次根式有关的化简求值先化简,再求值(x-1)²+x(x+2),其中x=√2先化简,再求值a-b分之a²-a-b分之b²,其中a=√3+1,b=√3-1
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![与二次根式有关的化简求值先化简,再求值(x-1)²+x(x+2),其中x=√2先化简,再求值a-b分之a²-a-b分之b²,其中a=√3+1,b=√3-1](/uploads/image/z/8542333-37-3.jpg?t=%E4%B8%8E%E4%BA%8C%E6%AC%A1%E6%A0%B9%E5%BC%8F%E6%9C%89%E5%85%B3%E7%9A%84%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%88x-1%EF%BC%89%26%23178%3B%2Bx%EF%BC%88x%2B2%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D%E2%88%9A2%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BCa-b%E5%88%86%E4%B9%8Ba%26%23178%3B-a-b%E5%88%86%E4%B9%8Bb%26%23178%3B%2C%E5%85%B6%E4%B8%ADa%3D%E2%88%9A3%2B1%2Cb%3D%E2%88%9A3-1)
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与二次根式有关的化简求值先化简,再求值(x-1)²+x(x+2),其中x=√2先化简,再求值a-b分之a²-a-b分之b²,其中a=√3+1,b=√3-1
与二次根式有关的化简求值
先化简,再求值(x-1)²+x(x+2),其中x=√2
先化简,再求值a-b分之a²-a-b分之b²,其中a=√3+1,b=√3-1
与二次根式有关的化简求值先化简,再求值(x-1)²+x(x+2),其中x=√2先化简,再求值a-b分之a²-a-b分之b²,其中a=√3+1,b=√3-1
1、原式=x^2-2x+1+x^2+2x
=2x^2+1
=2(√2)^2+1
=4+1
=5
2、原式=a^2/(a-b)-b^2/(a-b)
=(a^2-b^2)/(a-b)
=(a+b)(a-b)/(a-b)
=a+b
=√3+1+√3-1
=2√3