9x的平方-25y的平方怎么算
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25(x+y)²-9(x-y)² =[5(x+y)]²-[3(x-y)]² =[5(x+y)+3(x-y)][5(x+y)-3(x-y)] =(8x+2y
(x+y)^2-6x^2+6y^2+9(x-y)^2=x^2+2xy+y^2-6x^2+6y^2+9x^2-18xy+9y^2=4x^2-16xy+16y^2=4(x^2-4xy+4y^2)=4(x-
9x²-y²-4y-4=(3x)²-(y²+4y+4)=(3x)²-(y+2)²=(3x+y+2)(3x-y-2)
∵(x+y)²=25(x-y)²=9∴x²+2xy+y²=25①x²-2xy+y²=9②∴①+②=2x²+2y²=34x
25(x+y)的平方-9(x-y)的平方=[5(x+y)+3(x-y)][5(x+y)-3(x-y)]=(8x+2y)(2x+8y)=4(4x+y)(x+4y)
(x平方+y平方)平方-y平方=x平方+6所以(x²+y²)²-(x²+y²)-6=0(x²+y²+2)(x²+y
x^2+y^2=[(x+y)^2+(x-y)^2]/2=(25+9)/2=17
解4x的平方减9x的平方减2x+3y的平方=4x^2-9x^2-(2x+3y)^2=(2x+3y)(2x-3y)-(2x+3y)^2=(2x+3y)(2x-3y-2x-3y)=(2x+3y)(-6y)
最后y是四次方原式=(4x²-9y²)(x²+y²)=(2x+3y)(2x-3y)(x²+y²)
(x^2+y^2)^2-4x^2y^2=(x^2+y^2+2xy)(x^2+y^2-2xy)=(x+y)^2*(x-y)^2=(x^2-y^2)^2数学佰亊嗵为你解答,希望我的回答为您带来帮助!
x的平方-2xy+y的平方-5x+5y-6=(x-y)^2-5(x-y)+6=(x-y-2)(x-y-3)
4(x+y)的平方-25=[2(x+y)]的平方-5的平方=[2(x+y)+5][2(x+y)-5]=(2x+2y+5)(2x+2y-5)
平方差原式=(x-y+2x+3y)(x-y-2x-3y)=(3x+2y)(-x-4y)=-(3x+2y)(x+4y)
x的4次方y的平方-6x的平方y的平方+9y的平方=y²(x^4-6x^2+9)=y²(x²-3)²=y²(x+√3)²(x-√3)
(x²+16y²)²-64x²y²=(x²+16y²)²-(8xy)²=(x²+16y²+
x+y=4x^2+2xy+y^2=16x^2+y^2=12所以xy=(16-12)/2=2所以x和y是a^2-4a+2=0的两个根a^2-4a+2=0a=2±√2所以x=2+√2,y=2-√2或x=2
原式=(x+y)(x-y)
(x的平方+3x+3)(x的平方+3x+5)+1=[(x²+3x)+3][(x²+3x)+5]+1=(x²+3x)²+8(x²+3x)+15+1=(x
(x+y)的平方-6x的平方+6y的平方+9(x-y)的平方=(x+y)²-6(x²-y²)+9(x-y)²=(x+y)²-6(x+y)(x-y)+9