已知Y的三次方 4Y 3的值为10则2Y的三次方 8Y-16得什么
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/06 08:45:02
原式=2xy(x²+2xy+y²)=2xy(x+y)²=2*2*4²=64
A-B=x³+2y³-xy²-(-y³+x³+2xy²)=x³+2y³-xy²+y³-x³
已知a²-4b²-2=0所以a²-4b²=2所以(a+2b)³(a-2b)³=[(a+2b)(a-2b)]³=(a²-4
1展开:x^3+2xy(x+y)+4y^3=x^3+2x^2y+2xy^2+4y^3=x^2(x+2y)+2y^2(x+2y)代入,得02(x^20)^3-x^3y^2代入,两种可能1-1/4=3/4
由已知可得:2a的三次方y的二次方*(-4a的二次方y的四次方)=-8a的5次幂*y的6次幂=ma的五次方y的n次方则易得:m=-8,n=6所以:m+n=-8+6=-2再问:你自己写的么,你确定??再
(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
x^2+y^2=(x+y)^2-2xy=10^2-2*24=100-48=52x^3+y^3=(x+y)(x^2-xy+y^2)=10*(52-24)=10*28=280
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
X的三次方+Y的三次方+Z的三次方=(x+y)(x2-xy+y2)+Z的三次方=-z(x2-xy+y2)+Z的三次方(x+y=-z)=-z(x2-xy+y2-z2)=-z[x(x-y)+(y+z)(y
多项式+(-2)^3+4(x^2)y+5y^3=x^3-3(x^2)y+2y^3,即:多项式=x^3-3(x^2)y+2y^3-[(-2)^3+4(x^2)y+5y^3]=x^3-(x^2)y-3y^
(2x^4)y³-x³y^4=(x³y³)(2x-y)=(xy)³(2x-y)=4³×(1/16)=4
因为ax²+4ax+3是分母,所以ax²+4ax+3≠0.在平面直角坐标系上它又是一条抛物线,因为ax²+4ax+3≠0,所以它不能与x轴有交点,所以ax²+4
=xy(4x²+4xy+y²)=xy(2x+y)²
y-2x=-20102x-y=20102x^4y³-x³y^4=x³y³(2x-y)=(xy)³(2x-y)=10³×2010=201000
x+y=5x=5-y代入:xy=2,得:(5-y)y=2y²-5y=2y²+y=(5/2)y=
您好:(x+y)²=10²x²+2xy+y²=100-2xy=x²+y²-100x的三次方+y的三次方=280(x+y)(x²-x
y=4的平方=1616=x三次方-9x三次方=25X=5再问:谢谢哦
y的三次方
2三次方+4三次方+6三次方+.+30三次方=(2×1)³+(2×2)³+……+(2×15)³=2³×1³+……+2³×15³=8
x3+3xy-y3=(x-y)(x^2+y^2+xy)+3xy=-x^2-y^2+2xy=-(x-y)^2=-1