(1) a-(a²)/(a+1)-1
=(a²+a-a²-a-1)/(a+1)
=-1/(a+1)
(2) 3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)
= (3x-x-y-7y)/(x-4y)
=(2x-8y)/(x-4y)
=2
(3) x(2-1/x)+x/x²-2x*(x²-4)
=2x-1+1/x-2x³+8x
=10x-2x³+1/x-1
(4) (x-3)/(2x-4)÷(5/x-2)
=(x-3)/(2x-4) *(x-2)/5
=(x-3)/10
(5) m/m+3-6/9-m²÷2/m-3
=m/(m+3)-6/[(m+3)(3-m)]*(m-3)/2
=m/(m+3)+3/(m+3)
=(m+3)/(m+3)
=1
(6) (3a/a-3-a/a+3)*a²-9/a
=[3a(a+3)-a(a-3)]/(a²-9) *(a²-9)/a
=[3a(a+3)-a(a-3)]/a
=3a+9-a+3
=2a+12
(1)计算:a-(a^2)/(a+1)-1 (2)计算:3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)
(1)计算:a-(a^2)/(a+1)-1 (2)计算:3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)
(3)计算:x(2-1/x)+x/x^2-2x*(x^2-4)
(4)计算:(x-3)/(2x-4)÷(5/x-2--2)
(5)计算:m/m+3-6/9-m^2÷2/m-3
(6)计算:(3a/a-3-a/a+3)*a^2-9/a
(3)计算:x(2-1/x)+x/x^2-2x*(x^2-4)
(4)计算:(x-3)/(2x-4)÷(5/x-2--2)
(5)计算:m/m+3-6/9-m^2÷2/m-3
(6)计算:(3a/a-3-a/a+3)*a^2-9/a
数学人气:113 ℃时间:2020-04-01 14:51:27
优质解答
我来回答
类似推荐
猜你喜欢
- 1请问,用普通的荧光分光光度计做同步荧光的具体操作步骤是什么?
- 2一用电器接在电路中,若通电时间增加到原来2倍,则电功率为原来的——倍,电功为原来的-——倍%
- 3李叔叔周五开车从绵阳回到成都家中,每小时行60千米,周日从成都到绵阳的平均时速为40千米.那么李叔叔往
- 4考试考差了的反思作文500
- 5经过不在同一直线的三点最多可以画几条直线
- 6I don not think it is good to eat in class,Ben ,you should 空 it
- 7( )除以5=5分之3=10分之( )=( )分之21=( ),填小数.
- 8要一篇《最喜欢的XX地方》的作文要有方位词.300字很简单的
- 9质子和中子是怎样构成原子的
- 10英语翻译