2(6y²-3y+2)+2(y-1)-(2+12y²)y=½
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2(6y²-3y+2)+2(y-1)-(2+12y²)y=½
咨询记录 · 回答于2022-12-27
2(6y²-3y+2)+2(y-1)-(2+12y²)y=½
2(6y²-3y+2)+2(y-1)-(2+12y²)y=½
先化简再求值
12y²-6y+4+2y-2-2y+12y²y=½
12y^3十12y^2一6y十2一1/2=0
12y^3十12y^2一6y十3/2=0
4y^3十4y^2一2y十1/2=0
2y^3+2y^2一y十1/4=0
2y^2(y+1)一(y十1)十5/4=0
(y十1)十(2y^2一1)+5/4=0
(y十1)(√2y一1)(√2+1)=一5/4
(y十1)(√2y一1)(√2y+1)=一5/4
y1=一9/4
y2二一9√z/8
y3=一√2/8