若y-2x=3,则2(y-2x)^2-4(2x-y)^2-6x+3y的值是? 急啊!若x+5y-4z=6,3x+8y-7z=-4则x+y-z=( )观察下列等式:4-1=3,9-4=5,16-9=7,25-16=9,36-25=11.....x这些等式反映了自然数间的某种规侓,设n(n大于.等于1)为自
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若y-2x=3,则2(y-2x)^2-4(2x-y)^2-6x+3y的值是? 急啊!若x+5y-4z=6,3x+8y-7z=-4则x+y-z=( )观察下列等式:4-1=3,9-4=5,16-9=7,25-16=9,36-25=11.....x这些等式反映了自然数间的某种规侓,设n(n大于.等于1)为自
若y-2x=3,则2(y-2x)^2-4(2x-y)^2-6x+3y的值是? 急啊!
若x+5y-4z=6,3x+8y-7z=-4则x+y-z=( )
观察下列等式:4-1=3,9-4=5,16-9=7,25-16=9,36-25=11.....x这些等式反映了自然数间的某种规侓,设n(n大于.等于1)为自然数,试用关于n的代数式表示出其中的规律________
若a/b=7/5,b/c=3/2,那么(a-b)/(b+c)=____________
若y-2x=3,则2(y-2x)^2-4(2x-y)^2-6x+3y的值是? 急啊!若x+5y-4z=6,3x+8y-7z=-4则x+y-z=( )观察下列等式:4-1=3,9-4=5,16-9=7,25-16=9,36-25=11.....x这些等式反映了自然数间的某种规侓,设n(n大于.等于1)为自
2(y - 2x)² - 4(2x - y)² - 6x + 3y
= 2(y - 2x)² - 4(y - 2x)² + 3(y - 2x)
= -2(y - 2x)² + 3(y - 2x)
= -2×3² + 3×3
= -18 + 9
= -9
正负1
n+1的平方减去N的平方等于2N+1
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
若|x-3|+(y+2)=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
若|x-3|+(y+2)²=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8?(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8
若2x=3y,则(x*x+y*y)/x*x=?
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若5x+3y=3x+4y=x+2y+6,则x+y=___
若x/y=4/3 则3x+2y/2x-5y=
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=
若实数x,y满足x的平方+y的平方-4x-2y+5=0,则(x+y)/2x-3=
2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y