几道有关分式加减乘除的题目!计算2/X-1 - (1-3X)/2-2X结果计算a-b+2b²/a+b=化简(1-1/a-2)÷3-a/2a-4已知a+b=3,ab=1,则a/b+b/a=化简(x-1/y)÷(y-1/x)=若x等于它的倒数,则x²-4x+4/x+3÷ x-2/x²+6x+9
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/12 01:59:48
![几道有关分式加减乘除的题目!计算2/X-1 - (1-3X)/2-2X结果计算a-b+2b²/a+b=化简(1-1/a-2)÷3-a/2a-4已知a+b=3,ab=1,则a/b+b/a=化简(x-1/y)÷(y-1/x)=若x等于它的倒数,则x²-4x+4/x+3÷ x-2/x²+6x+9](/uploads/image/z/1167311-47-1.jpg?t=%E5%87%A0%E9%81%93%E6%9C%89%E5%85%B3%E5%88%86%E5%BC%8F%E5%8A%A0%E5%87%8F%E4%B9%98%E9%99%A4%E7%9A%84%E9%A2%98%E7%9B%AE%21%E8%AE%A1%E7%AE%972%2FX-1+-+%281-3X%29%2F2-2X%E7%BB%93%E6%9E%9C%E8%AE%A1%E7%AE%97a-b%2B2b%26sup2%3B%2Fa%2Bb%3D%E5%8C%96%E7%AE%80%281-1%2Fa-2%29%C3%B73-a%2F2a-4%E5%B7%B2%E7%9F%A5a%2Bb%3D3%2Cab%3D1%2C%E5%88%99a%2Fb%2Bb%2Fa%3D%E5%8C%96%E7%AE%80%EF%BC%88x-1%2Fy%EF%BC%89%C3%B7%EF%BC%88y-1%2Fx%29%3D%E8%8B%A5x%E7%AD%89%E4%BA%8E%E5%AE%83%E7%9A%84%E5%80%92%E6%95%B0%2C%E5%88%99x%26sup2%3B-4x%2B4%2Fx%2B3%C3%B7+x-2%2Fx%26sup2%3B%2B6x%2B9)
几道有关分式加减乘除的题目!计算2/X-1 - (1-3X)/2-2X结果计算a-b+2b²/a+b=化简(1-1/a-2)÷3-a/2a-4已知a+b=3,ab=1,则a/b+b/a=化简(x-1/y)÷(y-1/x)=若x等于它的倒数,则x²-4x+4/x+3÷ x-2/x²+6x+9
几道有关分式加减乘除的题目!
计算2/X-1 - (1-3X)/2-2X结果
计算a-b+2b²/a+b=
化简(1-1/a-2)÷3-a/2a-4
已知a+b=3,ab=1,则a/b+b/a=
化简(x-1/y)÷(y-1/x)=
若x等于它的倒数,则x²-4x+4/x+3÷ x-2/x²+6x+9
几道有关分式加减乘除的题目!计算2/X-1 - (1-3X)/2-2X结果计算a-b+2b²/a+b=化简(1-1/a-2)÷3-a/2a-4已知a+b=3,ab=1,则a/b+b/a=化简(x-1/y)÷(y-1/x)=若x等于它的倒数,则x²-4x+4/x+3÷ x-2/x²+6x+9
2/(X-1) - (1-3X)/(2-2X)
= 2/(X-1) + (1-3X)/{2(X-1)}
= ( 2*2+1-3X)/{2(X-1)}
= (5-3X) / {2(X-1)}
a-b + 2b^2 / (a+b)
= {(a-b)(a+b)+2b^2} / (a+b)
= {a^2-b^2+2b^2) / (a+b)
= (a^2+b^2)/(a+b)
{(1-1/(a-2)}÷(3-a)/(2a-4)
=(a-2-1)/(a-2) * 2(a-2)/{-(a-3)}
=-(a-3)/(a-2) * 2(a-2)/(a-3)
=-2
a+b=3,ab=1
a/b+b/a
=(a^2+b^2)/(ab)
={(a+b)^2-2ab}/(ab)
={3^2-2*1} / 1
=7
(x-1/y)÷(y-1/x)
= (xy-1)/y ÷ (xy-1)/x
=xy
x=1/x
x^2=1
x=±1
(x²-4x+4)/(x+3) ÷ (x-2)/(x²+6x+9)
= (x-2)^2/(x+3) * (x+3)^2/(x-2)
= (x+3)(x-2)
= x^2 + x - 6
= 1+x-6
= x-5
= ±1-5
= -6,或-4
2/(x-1)-(1-3x)/(2-2x)
=4/(2x-2)-(1-3x)/(2-2x)
=4/(2x-2)+(1-3x)/(2x-2)
=[4+(1-3x)]/(2-2x)
=(5-3x)/(2x-2)
a-b+2b²/(a+b)
=(a-b)(a+b)/(a+b)+2b^2/(a+b)
=(a^2-b^2)/(a+b)+2b^...
全部展开
2/(x-1)-(1-3x)/(2-2x)
=4/(2x-2)-(1-3x)/(2-2x)
=4/(2x-2)+(1-3x)/(2x-2)
=[4+(1-3x)]/(2-2x)
=(5-3x)/(2x-2)
a-b+2b²/(a+b)
=(a-b)(a+b)/(a+b)+2b^2/(a+b)
=(a^2-b^2)/(a+b)+2b^2/(a+b)
=(a^2-b^2+2b^2)/(a+b)
=(a^2+b^2)/(a+b)
[1-1/(a-2)]÷(3-a)/(2a-4)
=[(a-2)/(a-2)-1/(a-2)]÷(3-a)/(2a-4)
=[(a-2-1)/(a-2)]÷(3-a)/(2a-4)
=(a-3)/(a-2)÷(3-a)/(2a-4)
=(a-3)/(a-2)*(2a-4)/(3-a)
=(a-3)/(a-2)*2(a-2)/(3-a)
=2(a-3)/(3-a)
=-2(a-3)/(a-3)
=-2
a/b+b/a
=(a^2+b^2)/ab
=[(a^2+2ab+b^2)-2ab]/ab
=[(a+b)^2-2ab]/ab
=[3^2-2*1]/1
=9-2
=7
(x-1/y)÷(y-1/x)
=(xy/y-1/y)÷(xy/x-1/x)
=[(xy-1)/y]÷[(xy-1)/x]
=(xy-1)/y*x/(xy-1)
=x/y
x=1/x
x^2=1
x=±1
(x²-4x+4)/(x+3)÷ (x-2)/(x²+6x+9)
=(x-2)²/(x+3)÷ (x-2)/(x+3)²
=(x-2)²/(x+3)* (x+3)²/(x-2)
=(x-2)(x+3)
=x^2+x-6
=1+x-6
=x-5
当x=-1时,x-5=-1-5=-6
当x=1时,x-5=1-5=-4
收起
1、2/(X-1) - (1-3X)/(2-2X)
= 2/(X-1) + (1-3X)/{2(X-1)}
= ( 2*2+1-3X)/{2(X-1)}
= (5-3X) / {2(X-1)}
2、a-b + 2b^2 / (a+b)
= {(a-b)(a+b)+2b^2} / (a+b)
= {a^2-b^2+2b^2) / (a+b)
全部展开
1、2/(X-1) - (1-3X)/(2-2X)
= 2/(X-1) + (1-3X)/{2(X-1)}
= ( 2*2+1-3X)/{2(X-1)}
= (5-3X) / {2(X-1)}
2、a-b + 2b^2 / (a+b)
= {(a-b)(a+b)+2b^2} / (a+b)
= {a^2-b^2+2b^2) / (a+b)
= (a^2+b^2)/(a+b)
3、{(1-1/(a-2)}÷(3-a)/(2a-4)
=(a-2-1)/(a-2) * 2(a-2)/{-(a-3)}
=-(a-3)/(a-2) * 2(a-2)/(a-3)
=-2
4、a+b=3,ab=1
a/b+b/a
=(a^2+b^2)/(ab)
={(a+b)^2-2ab}/(ab)
={3^2-2*1} / 1
=7
5、(x-1/y)÷(y-1/x)
= (xy-1)/y ÷ (xy-1)/x
=xy
6、x=1/x
x^2=1
x=±1
(x-4x+4)/(x+3) ÷ (x-2)/(x+6x+9)
= (x-2)^2/(x+3) * (x+3)^2/(x-2)
= (x+3)(x-2)
= x^2 + x - 6
= 1+x-6
= x-5
= ±1-5
= -6,或-4
希望能给你帮助!
收起