(x+y)²=x²+2xy+y²(平方)那么(x+y)³=?(立方) (x-y)³=?(立方)
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(x+y)²=x²+2xy+y²(平方)那么(x+y)³=?(立方) (x-y)³=?(立方)
(x+y)²=x²+2xy+y²(平方)
那么(x+y)³=?(立方)
(x-y)³=?(立方)
(x+y)²=x²+2xy+y²(平方)那么(x+y)³=?(立方) (x-y)³=?(立方)
直接拆出来算就行了,没什么技巧.
(x+y)³
=(x+y)(x²+2xy+y²)
=x³+2x²y+xy²+x²y+2xy²+y³
=x³+3x²y+3xy²+y³
(x-y)³
=(x-y)(x-y)²
=(x-y)(x²-2xy+y²)
=x³-2x²y+xy²-x²y+2xy²-y³
=x³-3x²y+3xy²-y³
已知(x²+y²)(x²+y²-6)+9=0 ,求x²+y²的值.
若x²+xy-2y²=0,则x²+3xy+y²/x²+y²
x²+xy-2y²=0则x²+3xy+y²/x²+y²
怎么算啊这个:X²+4X+Y²-2Y+5=0 则X²+Y²=?²²²²²²²²²²²²X²+4X+Y²-2Y+5X=0 则X²+Y²=?
已知(x+y)²;=8,(x-y)²;=4,求x²+y²
已知x²y²+x²+y²=10xy-16 求x,y
(x²+y²)²-x²y²=(x²+y²)²-(xy)²=(x²+y²+xy)(x²+y²-xy)=(x+y)²(x-y)²-xy+xy=(x+y)²(x-y)²
x²+ y ²=4x 求x² + y ²的最大值,最小值
化简再求值[(x²+y²)²-4x²y²]÷(x²-y²)其实,x=2,y=2/3.
3x²-y²=8x²+xy+y²=4
4m²(2x-3y)²-m²(3x-2y)²=?
(X-3)²+(Y+4)²=1 求X²+Y²的最大值
(X-3)²+(Y+4)²=1 求X²+Y²的最大值
1.(x+y)²-4xy=( )²2.x²-( )+25y²=( )²3.x²-8x²y²+16y四次方=( )²4.7.2²-2.8²= .
x²-y²-x-y因式分解
函数y=(sin²x)²+(cos²x)²的最小正周期
x²-y²=1{(x-y)²-2(x-y-2)=7
x²-4y² x+2y---------- ÷ --------分数线x²+2xy+y² x²+xyx²-4y² x+2y----------÷--------分数线x²+2xy+y² x²+xy(x+2y)(x-2y)x(x+y)=----------------(x+y)(x+y)(x+2y)(x-y)x=------(x+y)这样对了吗?