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x2+4y2 x2-2y+1 -x2+4y2 -x2-4y2
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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)
4x与4 y 4y与4xy 4xy2与4x2y 4xy2与4y2x
x2+4y2; -x2-4y2; x2-2y2+1; x2-4y2。
x^(2* /4*y^n x^(2 /(4y^ x^(2* /(4*y^ x^(2 /4y^n
x2+4y2 x2﹣2y2+1 ﹣x2+4y2 ﹣x2﹣4y2
x^(2*/4*y^n x^(2/(4y^ x^(2*/(4*y^ x^(2/4y^n
(4x-3y)(-3y-4x) (2x2-y2)(2x2+y2) (a+b-c)(-c-b+a) (-x+y)(x-y)
)4x+y+3=0( )x+4y+3=0 ( )4x+y-3=0 ( )x ─4y─3=0
a2﹣b2=(a﹣b)2 x2+4y2=(x+2y)2 2﹣8a2=2(1+2a)(1﹣2a) x2﹣4y2=(x+4y)(x﹣4y)
y'"+y"-4y'-4y=0. y'"+y"+4y'+4y=0. y'"-y"-4y'+4y=0. y'"-y"+4y'-4y=0.
)y1 >y2 ( )y1 =y2 ( )y1 )不能比较