计算:(1)[(X-Y)^2-(X+Y)(X-Y)]/(-2Y) (2)(2a+1)^2-(2a+1)(2a-1) (3)(2x-y-3)(2x-y+3)
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/29 12:49:16
计算:(1)[(X-Y)^2-(X+Y)(X-Y)]/(-2Y)(2)(2a+1)^2-(2a+1)(2a-1)(3)(2x-y-3)(2x-y+3)计算:(1)[(X-Y)^2-(X+Y)(X-Y)
计算:(1)[(X-Y)^2-(X+Y)(X-Y)]/(-2Y) (2)(2a+1)^2-(2a+1)(2a-1) (3)(2x-y-3)(2x-y+3)
计算:(1)[(X-Y)^2-(X+Y)(X-Y)]/(-2Y) (2)(2a+1)^2-(2a+1)(2a-1) (3)(2x-y-3)(2x-y+3)
计算:(1)[(X-Y)^2-(X+Y)(X-Y)]/(-2Y) (2)(2a+1)^2-(2a+1)(2a-1) (3)(2x-y-3)(2x-y+3)
(1)[(X-Y)^2-(X+Y)(X-Y)]/(-2Y)
=[(x^2-2xy+y^2)-(x^2-y^2)]/(-2y)
=[x^2-2xy+y^2-x^2+y^2]/(-2y)
=(2y^2-2xy)/(-2y)
=x-y
(2)(2a+1)^2-(2a+1)(2a-1)
=(4a^2+4a+1)-4a^2+1
=4a+2
(3)(2x-y-3)(2x-y+3)
=[(2x-y)-3][(2x-y)+3]
=(2x-y)^2-9
=4x^2-4xy+y^2-9
计算(x+y-1)^2
(x+y)(x-y)-(2x+y)(x-y+1)计算要过程
计算:y-x分之x+y+x-y分之y-y-x分之2x-y
计算:2/x+1/(x-y)
计算2x/x-y
计算：1/2x-1/x+y×（x+y/2x-x-y)
计算:1/(2x) - 1/(x+y)（(x+y)/(2x) - x - y）
1/(2x) - 1/(x+y)*((x+y)/(2x)-x-y) 计算.
计算2x/1-x+y/1·（2x/x+y-x-y）
计算:(x+2y)(2x-y)
计算:(x+3y)(2x-y)
计算:(2x-3y)(x+y)
计算:(-x-2y) * (3x-y)
计算：(x+y)-3(x-2y).
计算:(4xy(x-y)^-1+(x(y^-1)-(x^-1)y)/((x^-1)+(y^-1)))*(x+y)^-2
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
计算：[(x+y)(x-y)-(x-y)^2+2y(x-y)]/(-2y)
计算：(1+ y/x-y )·(1- x/x+y)