初三数学分式的加减法x. x2已知 _______=7,求_______ x2-x+1. x4+x2+1求解题步骤
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初三数学分式的加减法x. x2已知 _______=7,求_______ x2-x+1. x4+x2+1求解题步骤
初三数学分式的加减法
x. x2
已知 _______=7,求_______
x2-x+1. x4+x2+1
求解题步骤
初三数学分式的加减法x. x2已知 _______=7,求_______ x2-x+1. x4+x2+1求解题步骤
x2-x+1=7
x2-x-6=0
(x-3)*(x-+2)=0
x1=3;x2=-2
x4+x2+1=(x2+1/2)2+3/4
当=3时,(9+0.5)2+0.75=91
当X=-2时,(4+0.5)2+0.75=21
67
忘了