1.当a=根号2,b=1时,求(a^4-a^2b^2)/(a^2-ab) 2.已知x=根号2+1,求x+1-(x^2/x-1)的值 3.x^2-1/x-1+(1+1/x),其中x=根号2-1 4.已知实数a满足a^2+2a-8=0,求(1/a+1)-(a+3/a^2-1)*a^2-2a+1/a^2+4a+3 5.已知a=(1/20)x+20, b=(1/20)x+19,c=(1/20)x+21, 求代数式a^... 1.当a=根号2,b=1时,求(a^4-a^2b^2)/(a^2-ab) 2.已知x=根号2+1,求x+1-(x^2/x-1)的值 3.x^2-1/x-1+(1+1/x),其中x=根号2-1 4.已知实数a满足a^2+2a-8=0,求(1/a+1)-(a+3/a^2-1)*a^2-2a+1/a^2+4a+3 5.已知a=(1/20)x+20, b=(1/20)x+19,c=(1/20)x+21, 求代数式a^2+b^2+c^2-ab-bc-ac 帮帮忙,不要只给得数~详细步骤的追加分... 展开