(分数线用/代替吧)通分:1.2x/x²+y²,y/(x+y)² 2.y/2(x-y),x/(y-x)² 3.1/a²-4,1/a²-4a+44.a+1/a²-2a+1,a/a²-a计算:1.(1+b/a) ÷ (1-b/a) 2.a²-b²/a-b ÷ (2+ a²+b²/ab) 3.(x/x
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![(分数线用/代替吧)通分:1.2x/x²+y²,y/(x+y)² 2.y/2(x-y),x/(y-x)² 3.1/a²-4,1/a²-4a+44.a+1/a²-2a+1,a/a²-a计算:1.(1+b/a) ÷ (1-b/a) 2.a²-b²/a-b ÷ (2+ a²+b²/ab) 3.(x/x](/uploads/image/z/5618635-43-5.jpg?t=%EF%BC%88%E5%88%86%E6%95%B0%E7%BA%BF%E7%94%A8%2F%E4%BB%A3%E6%9B%BF%E5%90%A7%EF%BC%89%E9%80%9A%E5%88%86%EF%BC%9A1.2x%2Fx%26%23178%3B%2By%26%23178%3B%2Cy%2F%28x%2By%29%26%23178%3B+2.y%2F2%28x-y%29%2Cx%2F%28y-x%29%26%23178%3B+3.1%2Fa%26%23178%3B-4%2C1%2Fa%26%23178%3B-4a%2B44.a%2B1%2Fa%26%23178%3B-2a%2B1%2Ca%2Fa%26%23178%3B-a%E8%AE%A1%E7%AE%97%EF%BC%9A1.%281%2Bb%2Fa%29+%C3%B7+%EF%BC%881-b%2Fa%EF%BC%89+2.a%26%23178%3B-b%26%23178%3B%2Fa-b+%C3%B7+%EF%BC%882%2B+a%26%23178%3B%2Bb%26%23178%3B%2Fab%EF%BC%89+3.%EF%BC%88x%2Fx)
(分数线用/代替吧)通分:1.2x/x²+y²,y/(x+y)² 2.y/2(x-y),x/(y-x)² 3.1/a²-4,1/a²-4a+44.a+1/a²-2a+1,a/a²-a计算:1.(1+b/a) ÷ (1-b/a) 2.a²-b²/a-b ÷ (2+ a²+b²/ab) 3.(x/x
(分数线用/代替吧)
通分:1.2x/x²+y²,y/(x+y)² 2.y/2(x-y),x/(y-x)² 3.1/a²-4,1/a²-4a+4
4.a+1/a²-2a+1,a/a²-a
计算:1.(1+b/a) ÷ (1-b/a) 2.a²-b²/a-b ÷ (2+ a²+b²/ab) 3.(x/x-2 - x/x+2) ÷ 4x/x-2
4.(a/a-1 - 2a/a²-1) ÷ (1- 1/a+1)
解方程:1.4/x-4=1/x+3 2.3/x-1=1/x+1 3.x-1/x+3 -2/x-1=1
4.6/x-1 -x+5/x²-x=0
用一元一次方程的分式方程的应用:1.同学们在计算机课上学打字,梨花比王艳每分钟多录入20个字,梨花录入300个字与王艳录入200个字的时间相同.问梨花、王艳每分钟各录入多少字?
2.小明家要装修一套房子,若由甲、乙两个装饰公司合作需要六周完成,若先由甲公司做4周后,剩下的工程由乙公司来做,则还需要九周才能完成.小明家想选一家公司来做,请你帮助小明家分析一下,假设两家的工程质量都一样,从装修的时间比较少来考虑,选哪家公司更合适?
(分数线用/代替吧)通分:1.2x/x²+y²,y/(x+y)² 2.y/2(x-y),x/(y-x)² 3.1/a²-4,1/a²-4a+44.a+1/a²-2a+1,a/a²-a计算:1.(1+b/a) ÷ (1-b/a) 2.a²-b²/a-b ÷ (2+ a²+b²/ab) 3.(x/x
拼了……
通分部分我看不懂,嘛意思, y/2(x-y)这个怎么通……求楼主示下……(可以追答)
计算 1.(a+b)/(a-b)(这是化简吗~) 2.ab/(a+b) 3.1/(x+2) 4.a/(a+1)
解方程 1.3/7 2.1 3.lz有没有漏打括号…… 4.lz有没有漏打括号……(这两题解有点另类,so我问问)
解答1.设W为x,则L为(x+20),得式:300/(x+20)=200/x 解得x=40 即W=40 L=60 时间5分钟
2.分析得:由甲公司做4周后,剩下的量可由甲做2周,乙做6周完成;而由乙公司来做,则还需要9周才能完成,可知甲做2周与乙做3周的量相同,一目了然~
一些题目没过程,楼主看不懂问~有可能是看错或打错,楼主见谅~
纯手打,累啊!静待楼主……