早教吧作业答案频道 -->数学-->
当x=1/2,y=3,z=1/4时,求下列代数式的值x²-2xy+y²2/(x-z)²+24xz/y
题目详情
当x=1/2,y=3,z=1/4时,求下列代数式的值
x²-2xy+y²
2/(x-z)²+24xz/y
x²-2xy+y²
2/(x-z)²+24xz/y
▼优质解答
答案和解析
x²-2xy+y²=(x-y)^2=(1/2-3)^2=25/4;
2/(x-z)²+24xz/y=2/(1/2-1/4)^2+(24x1/2x1/4)/3=2x16+3/3=32+1=33
2/(x-z)²+24xz/y=2/(1/2-1/4)^2+(24x1/2x1/4)/3=2x16+3/3=32+1=33
看了当x=1/2,y=3,z=1/...的网友还看了以下:
若x,y,z为正整数,且满足不等式x/3>=z>=y/2,y+z>=1997,则x的最小值问:以下 2020-05-20 …
化简[x^3(y^2-z^2)+y^3(z^2-x^2)+z^3(x^2-y^2)]/[x^3(y 2020-06-03 …
X/(Y+Z)+Y/(X+Z)+Z/(X+Y)=1,求X^2/(Y+Z)+Y^2/(X+Z)+Z^ 2020-06-12 …
隐函数求导问题下列方程均确定了函数z=z(x,y).(1)f(ax-cz,ay-bz)=0,f可微 2020-07-22 …
方程组(xy+x)/(x+y+1)=2(xz+2x)/(z+y+2)=3(y+1)(z+2)/(z 2020-08-01 …
由(x^2+y^2+z^2)*(x+y+z)=x^3+y^3+z^3+(x+y)z^2+(y+z)x 2020-11-01 …
2(x^3+y^3+z^3)大于等于x^2(y+z)+y^2(y+z)+z^2(x+y) 2020-11-01 …
很简单的题目!~急!~已知x,y,z都是有理数,且(z^3+(1/z^3)-x)^2与(z+(1/z 2020-11-01 …
已知x>=y>=z>0,求证:x^2/y+y^2/z+z^2/x>=x^2/z+y^2/x+z^2/ 2020-11-01 …
我究竟错哪里了常微分方程求解dy/dx=2((y+2)/(x+y-1))^2我的解法如下两边求倒数2 2020-12-12 …