因式分解:x2-y2+x3-y3
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因式分解:x2-y2+x3-y3因式分解:x2-y2+x3-y3因式分解:x2-y2+x3-y3解x²-y²+x³-y³=(x-y)(x+y)+(x-y)(x&
因式分解:x2-y2+x3-y3
因式分解:x2-y2+x3-y3
因式分解:x2-y2+x3-y3
解
x²-y²+x³-y³
=(x-y)(x+y)+(x-y)(x²+xy+y²)
=(x-y)(x+y+x²+xy+y²)
x³-y³
=(x-y)(x²+xy+y)立方差公式
(X+Y)(X-Y)+(X+Y)(X平方-XY+Y平方)
x²-y²+x³-y³
=(x+y)(x-y)+(x-y)(x²+xy+y²)
=(x-y)(x+y+x²+xy+y²)
给好评啊!!!
原式=(x+y)(x-y)+(x-y)(x平方+xy+y平方)=(x-y)(x平方+xy+x+y+y平方)
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请帮我因式分解以下两题 1.x2- y2+ x3- y3 2.a(a-b+2)-6b(b+1) ,
(x-y)2(x2+xy+y2)2-(x3+y3)(-x3+y3),其中x=1,y=-1
为什么重心坐标为x1+x2+x3)/3,(y1+y2+y3)/3令A(x1,y1)B(x2,y2)C(x3,y3) BC中点是((x2+x3)/2,(y2+y3)/2),然后不是和坐标向加后再乘1/3吗?
解方程组:y2=x3-3x2+2x;x2=y3-3y2+2y2为平方