(1-X^2)(1-Y^2)-4XYx^2=x平方

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/28 19:49:26
(1-X^2)(1-Y^2)-4XYx^2=x平方(1-X^2)(1-Y^2)-4XYx^2=x平方(1-X^2)(1-Y^2)-4XYx^2=x平方(1-X^2)(1-Y^2)-4XY=1-X^2-

(1-X^2)(1-Y^2)-4XYx^2=x平方
(1-X^2)(1-Y^2)-4XY
x^2=x平方

(1-X^2)(1-Y^2)-4XYx^2=x平方
(1-X^2)(1-Y^2)-4XY
=1 - X^2 - Y^2 + X^2 * Y^2 - 4XY
=( 1 - 2XY + X^2 * Y^2 ) - ( X^2 + 2XY + Y^2 )
=( 1 - XY )^2 - ( X + Y )^2
=( 1 - XY + X + Y )( 1 - XY - X - Y )

=1-Y^2-X^2+X^2*Y^2-4xy
=1-(X^2+Y^2+2xy)+xy(xy-2)
=1-(x+y)^2+xy(xy-2)

你这是什么意思?问题是?