(x+2y-1)乘(x-2y+1)-(x-2y-1)的二次方
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(x+2y-1)乘(x-2y+1)-(x-2y-1)的二次方
(x+2y-1)乘(x-2y+1)-(x-2y-1)的二次方
(x+2y-1)乘(x-2y+1)-(x-2y-1)的二次方
原式=[x+(2y-1)][x-(2y-1)]-[(x-2y)-1]2
=x2-(2y-1)2-[(x-2y)2-2(x-2y)+1]
=x2-(4y2-4y+1)-(x2-4xy+4y2-2x+4y+1)
=x2-4y2+4y-1-x2+4xy-4y2+2x-4y-1
=4xy-8y2+2x-2
x的平方-y/x乘y/x-(2x-1)y
(x+2y-1)乘(x-2y+1)-(x-2y-1)的二次方
2x分之1 减 x+y分之1 乘 (2x分之x+y减x减y)
x+y/根号X-根号Y-2XY/X乘根号Y-Y乘根号X
y=1/[x乘(2次根号下x)]
2[(x-y)^3]^2乘3(y-x)^3乘2分之1[(y-x)^2]^5
x-2分之1的绝对值+2y+1=0,x乘x+y乘y的值是多少?
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利用乘除法运算公式计算5(x+y)(x-y)-2(x+y)^2+3(x-y)^2其中x=2,y=1
(x+y分之x加x+y分之2y)乘x+2y分之xy除(x分之1加y分之1)等于?
(X+Y分之X+X+Y分之2Y)乘X+2Y分之XY除以(X分之1+Y分之1)要有过程
X+Y分之X+X+Y分之2Y)乘X+2Y分之XY除以(X分之1+Y分之1)得?
(1)x²+y²-2xy分之xy (分开的) 乘 3x²分之x-y (2)(x-y分之x - x-y分之2y) 乘 下面还有(1)x²+y²-2xy分之xy ( 分开的) 乘 3x²分之x-y(2)(x-y分之x - x-y分之2y) 乘 x-2y分之xy 除以(x分之1+y
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2/3x-2/x+y乘{x+y/3x-(x+y)}
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