数学题:当x=根号3/3,求代数式(x^2-3x)/(x-2)/[x+3/(2-x)]的值
数学题:当x=根号3/3,求代数式(x^2-3x)/(x-2)/[x+3/(2-x)]的值
原代数式=[(x²-3x)/(x-2)]/[(x²-2x-3)/(x-2)]=[(x²-3x)/(x-2)]/[(x-3)(x+1)/(x-2)]=x/(x+1)
将x=√3/3代入
原式=(√3/3)/(√3/3+1)=(√3-1)/2
数学题:当x=根号3/3,求代数式(x^2-3x)/(x-2)-[x+3/(2-x)]的值
(x^2-3x)/(x-2)-[x+3/(2-x)]
=(x^2-3x)/(x-2)+[-x+3/(x-2)]
=(x^2-3x)/(x-2)+[(-x^2+2x+3)/(x-2)]
=(x^2-3x-x^2+2x+3)/(x-2)
=(-x+3)/(x-2)
将x=√3/3代入
原式=(-√3/3+3)/(√3/3-2)
=-(17+√3)/11
当x=根3/3时,代数式x的平方-3x/x-2除(x+3/2-x)的值是?
已知x=(根号3)/3,那么:
(x²-3x)/(x-2) ÷[(x+3)/(2-x)]
=[x(x-3)/(x-2)]×(2-x)/(x+3)
=-x(x-3)/(x+3)
=x(9-3x)/(3x+9)
=(根号3/3)(9-根号3)/(根号3+9)
=(根号3/3)(9-根号3)²/[(根号3+9)(9-根号3)]
=(根号3/3)(84-18根号3)/78
=(根号3)(28-6根号3)/78
=(根号3)(14-3根号3)/39
=(14根号3- 9)/39
当x=根号3/3时,代数式x*x-3x/x-2/(x+3/2-x)的值是求大神帮助
我来!楼主等等。我用“画图”给你写出来。打字太麻烦。
一道数学题:当x=根号3/3,代数式x的平方-3x/x除以(x+3/2-x)的值是多少?
题目意思不是很明确,是[(X*X-3X)/X]/[(X+3)/(2-X)]吗?那么答案是(32倍根号3-93)/39
已知x+1/x=13/6,求代数式x^2+3x-1+3/x+3/x^2的值
x^2+3x-1+3/x+1/x^2
=[x+(1/x)]^2-2x(1/x)+3[x+(1/x)]-1
=(13/6)^2-2+3(13/6)-1
=295/36
已知(x-根号2+1)(x-2)=0,求代数式[(x-1)/(x-3)-(x-4)/x]÷(x^2+x-6)/(x^2+3x)的值
0
鉴定完毕。
速度给答案,当x=根号3/3时,代数式:((x平方-3x)/x-2)/(x+(3/2-x))的值是,答案知道,求过程
解:
原式=([x(x-3)]/(x-2))/([(x-3)(x+1)]/(x-2))=
[x(x-3)]/[(x-3)(x+1)]=x/(x+1),当x=根号3/3时,代入得答案为√3/(√3+3)
当x=-2时,求代数式3x-1/2-(2x+3/3-2-x/2)的值
解:原式=3x-1/2-2x-3/3+2+x/2
=3x-2x+x/2-1/2-3/3+2
=3x-2x+(1/2)x-1/2-3/3+2
=(3/2)x+0.5
当x=-2时,原式=(3/2)×(-2)+0.5
=(-3)+0.5
=-2.5
已知x=根号2-1,求代数式x/x-2÷(2+x-4/2-x)的值
x/(x-2)÷[2+(x-4)/(2-x)]
=x/(x-2)÷[2-(x-4)/(x-2)]
=x/(x-2)÷{[2(x-2)-(x-4)]/(x-2)}
=x/(x-2)÷[x/(x-2)]
=x/(x-2)×[(x-2)/x]
=1
本题结果只要x≠0,x≠2,结果与x取值无关
当x=√2-1时,原式=1