15+5x=20+xx是多少?
解方程1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20
当X取何值时,代数式XX-5X+7的值最小?最小值是多少?
5x-1=4x 求XX=多少
已知xx-5x+1=0,求xxxx+1/xx的值
x+xx+xxx=xxxx
已知X*X-5X+1=0,求X*X+1/XX的值
已知:3x=xx-x+1求(xxxx+xx+1)分之xx
已知x/(xx+x+1)=a,求xx/(xxxx+xx+1)的值
已知xx-2x-1=0,求xxxx-xxx-5xx-7x+5的值拜托各位大神
已知xx+5x-998=0.试求代数式xxx+6xx-993x+1008的值.
(x-y)(x+y)(xx-yy)=?
XXX*XX=XX*XX=3624,X内填写1-9,数字不能重复