若A等于5x的三次方 6y的三次方-搜答案-智慧作业帮

X³+Y³=(X+Y)(X²-XY+Y²)

a³+b³+c³-3abc=(a³+3a²b+3ab²+b³+c³)-(3abc+3a²b+3ab²

（x+y）三次方×（2x+2y）三次方×（3x+3y）三次方=(x+y)³×8(x+y)³×27(x+y)³=216((x+y)的9次方

已知A=x³+2y³-xy²,B=-y³+x³+2xy²,其中x等于1\3,y等于2A-B=（x³+2y³-xy

(x-y）³×（x-y）²×（y-x）=（x-y）³×（x-y）²×[-(x-y)]=-（x-y）的6次方

已知x+y=1,则x^3+y^3+3xy=（x+y）(x^2-xy+y^2)+3xy=1×(x^2-xy+y^2)+3xy=x^2-xy+y^2+3xy=x^2+2xy+y^2=(x+y)^2=1^2

解(x-y)(y-x)²(x-y)³=(x-y)(x-y)²(x-y)³=(x-y)^6

(a)^3/2,(x/2y)^3/2且(x

=xy(4x²+4xy+y²)=xy(2x+y)²

x的三次方+8y三次方=(x+2y)(x平方-2xy+4y平方）

阅读题意,已知X的三次方等于4,y的三次方等于6应该是已知3的x次方等于4,3的y次方等于6因为3^x=4,3^y=6所以(xy)^3=24则9的2x-y次方减27的x-y次方＝3^(4x-2y)-3

x^3-y^3=x^3-x^2y+y^2x-yx^2+xy^2-y^3=x^2(x-y)+xy(y-x)+y^2(x-y)=(x-y)(x^2-xy+y^2)

x³y-xy³=xy(x²-y²)=xy(x+y)(x-y)

根号负a的三次方x的三次方

A=x³＋2x²y＋2y³－1,B=3＋y³－2x²y＋2x³∵A+B+C=0∴C=－A－B=－x³－2x²y－2y&#

x^3+x-y^3-y=(x^3-y^3)+(x-y)=(x-y)(x^2+xy+y^2)+(x-y)=(x-y)(x^2+xy+y^2+1).x^3-x^2-y^3+y^2=(x^3-y^3)-(x

您好：x的三次方(y-x)的三次方-(x-y)的三次方=x的三次方(y-x)的三次方+(y-x)的三次方=（x³+1）(y-x)³=（x+1）（x²-x+1）(y-x)&

(x+y)^3=x^3+3x^2y+3y^2x+y^3

(x-y)*(x^2+xy+y^2)

题目是不是(x^3+y^3)/(x+y)?应该等于x^2+xy+y^2