2x一y平方等于多少
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 21:06:18
![2x一y平方等于多少](/uploads/image/f/262689-33-9.jpg?t=2x%E4%B8%80y%E5%B9%B3%E6%96%B9%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
x平方乘以y平方=(xy)^2
x=3y=-1或x=-1y=3
(3x-2y+四分之一)^2=(3x-2y)^2+1/2(3x-2y)+1/16=9x^2-12xy+4y^2+3/2x-y+1/16
(2x-3y)的平方*(2x+3y)的平方=(4x²-9y²)²=16x^4+81y^4-72x²y²
x^2-6x+9-y^2=(x-3)^2-y^2=(x-3+y)(x-3-y)=(x+y-3)(x-y-3)
|2x-y+1|+(x+2y-7)的平方等于0则有2x-y+1=0--->2x-y=-1x+2y-7=0--->x+2y=7两式相加得3x+y=6与2x-y=-1相加得5x=5x=1y=3所以(x+y
(2x-3y)的平方*(2x+3y)的平方=(4x^2-9y^2)^2=16x^4-72x^2*y^2+81Y^4
(5x-2y)的平方-(5x+2y)的平方=(5x-2y+5x+2y)(5x-2y-5x-2y)=10x*(-4y)=-40xy
等于2(x+y)^2-xy再问:详细些,再答:2x^2+3xy+2y^2=2x^2+4xy+2y^2-xy=2(x^2+2xy+y^2)-xy=2(x+y)^2-xy
y=2x^2y'=4x再问:。。请问能写下过程吗?我看不懂。。再答:x^n=nx^(n-1)x^2=2x^(2-1)=2x2*2x=4x
(3y+2x-1)(3y-2x+1)={3y+(2x-1)}{3y-(2x-1)}=3y平方-(2x-1)平方=3y平方-4x平方+4x-1
x²+y²=x²-xy+y²+xy=3+5=82x²+xy+3y²=2x²-2xy+3y²+3xy=2(x²-
∵2(x+y)²-3x-3y-2=02(x+y)²-3(x+y)-2=0[(2(x+y)+1][(x+y)-2]=02(x+y)=-1或(x+y)=2即:x+y=-1/2或x+y=
2Y分之X平方
因式分解原式=[x(x-2)]/[-y(x-2)]=-x/y
(2x+y)平方=4x平方+4xy+y平方(-x+2y)平方=x平方-4xy+4y平方
(x+2)^2-(y-3)^2=(x+y)*(x-y)x^2+4x+4-y^2+6y-9=x^2-y^24x+6y-5=0即为所求的方程
用平方差公式.(3x+2y)²-(3x-2y)²=[(3x+2y)+(3x-2y)][(3x+2y)-(3x-2y)]=(6x)(4y)=24xy