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2x>3y>5z 3y>5z>2x 3y>2x>5z 2x>5z>3y
y=x y=﹣2x﹣1 y=2x﹣1 y=1﹣2x
y'=e-2x y'=-e-2x y'=-2e-2x y'=-2xe-2x
x2+6xy+9y2=(x+3y)2 2x2﹣4xy+9y2=(2x﹣3y)2 2x2﹣8y2=2(x+4y)(x﹣4y) x(x﹣y)+y(y﹣x)=(x﹣y)(x+y)
)2x(3x-2)=5x2-4x ( )(2y +3x)(3x-2y)=9x2-4y2 ( )(x+2) 2=x2+2x+4 ( )(x+2)(2x-1)=2x2+5x-2
y=2x -1 y=2x +1 y=2 (x -1) y=2 (x +1)
2x + y = 3z 2x —=2 2xy—3y = 0 3x—5y=2
y=2x2+2x+12 y=2x2-2x+12 y=2x2+2x-12 y=2x2-2x-12
开口向下 对称轴是y轴 都有最低点 y随x的增大而减小
y=2x+2 y=2x﹣6 y=2x﹣4 y=2(x+3)
y=2x+5 y=2x﹣1 y=2x﹣9 y=2x﹣3
y=ax2+bx+c+x(dx+e)e-2x. y=x2(ax2+bx+c)+x2e-2x. y=(ax2+bx+c)+(dx+e)e-2x. y=x2(ax2+bx+c)+x(dx+e)e-2x.
y′=2xcos 2x-x2sin 2x y′=2xcos 2x-2x2sin 2x y′=x2cos 2x-2xsin 2x y′=2xcos 2x+2x2sin 2x
x2+x2=x4 3x3y2﹣2x3y2=1 4x2y3+5x3y2=9x5y5 5x2y4﹣3x2y4=2x2y4
y=﹣2x+24(0<x<12) y=﹣x+12(0<x<24) y=2x﹣24(0<x<12) y=x﹣12(0<x<24)