已知(x+y)^2=7,(x-y)^2=3,求x^2+y^2与xy的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/08 13:17:51
xRrP&3}$$Ix(-ĆSlK\"^ZEchcNO3Xf:{VڼNwf̬ā<AQP7yi[\\,ժe_fsج;/
X=BRÛxx\SLl."pJNo>:8);ZنWK8iýVuf>t?P6VuQLY' ̈́s9KᴢDE
'"Y~z)!L"PL1$(S!,'$ѴA8ISbIJXJEe")_:`7Ѥ
b1|6>yKcu+k▬d}I0BRC2,G,X$BX G#6'Nhu+f ptf?Gwbs}֨MF3pb5kφ^G"xO
swI
已知方程组{(X+Y)-3(X-Y)=7,2(X+Y)+(X-Y)=-7}则(X+Y)(X-Y)=
已知(x+y)2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值
把下列各式分解因式 x(x+y)(x-y)-x(y+x)² 2 已知2x+y=6,x-3y=1,求7y(x-3y)²把下列各式分解因式x(x+y)(x-y)-x(y+x)²7、已知2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x-y/x=x/x-2y(y不等于0),求x:y的值
已知x、y满足方程组{7x+6(x-y)=130,则x--y的值是( ).{7y-2(x-y)=10
已知(x-y)/13=y/7,则(x+y)/y=已知x/6=y/4=z/3(x,y,z均不为零),则(x+3y)/(3y-2z)=
已知y=2x,z=2y,则x+y+x等于()
已知(x+y)²-2(x+y)+1=0,则x+y=?
已知(x+y)×(x+y+2)-8=0,求x+y的值
已知(x+y)(x+y-10)+25=0,且x-y=2,求x,y的值?
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知2x+y=6,x-3y=1,求7y(x-3y)-2(3y-x)的值.
已知x²-y²=10,求[(x+y)³-2y(x+y)²-4(x+y)]÷(x+y)的值
已知y=y(x)的导数y',y‘’存在,且y=y(x)的反函数为x=x(y),试用y',y''表示(d^2x)/dx^2 —(y'')/(y')^3
已知2x-y=0,求分式【1+(3*y*y*y/x*x*x-y*y*y)】/【1+(2y/x-y)】的值注:x*x*x-y*y*y=(x-y)*(x*x+xy+y*y)
已知x=3分之1,y=二分之一,求代数式x-(x+y)+(x+2y)-(x+3y)+...-(x+13y)的值
已知x/y=2/3,求x²-y²/xy÷[(x+y)(x-y/x)³]÷x/y²的值
已知:【(x²+y²)-(x-y)²+2y(x-y)】÷4y=,求4x/(4²-y²)-1/(2x+y)的值已知:【(x²+y²)-(x-y)²+2y(x-y)】÷4y=1,求4x/(4²-y²)-1/(2x+y)的值