3x÷x÷5=32,求x

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姹倅=2x虏+3x+1鍦╗-1,1]涓婄殑鍊煎烟刚刚打错了 求y=2x²+3x+1在[-1,1]上的值域
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对称轴x=-1/31离对称轴最远,所以最大值在x=1处取得,6最小值是顶点处,-1/8要是还不懂的话,画图像看看
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单调增区间[0,6]
x²y+3xy+y=2xyx²+(3y-2)x+y=0x是实数则方程有解若y=0,则2x=0,x=0所以y=0能取到若y≠0则是二次方程,判别式大于等于0所以(3y-2)²-4y²≥05y²-12y+4≥0(5y-2)(y-2)≥0y≤2/5,y≥2...
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姹倄虏+2xy-3y虏+3x+y+2求x²+2xy-3y²+3x+y+2
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x2+2xy-3y2+3x+y+2 =(x+3y)(x-y)+3x+y+2=(x+3y+2)(x-y+1)
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