Simplifying rational expressions

[Alexstrasuz1]

If its not problem for you to check these last two. I got no more of these.
If you have some kind a book with tasks like this on internet I would love to print it out so I can have some fun.
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1ST answer 20/3
2ND answer -20/3

 

[anemone]

I'd appreciate it if you could type the problems and your answers up in $\LaTeX$, that would make your problems more readable for us.:) For these last two problems, I couldn't tell if the first problem mentions of $\left(\dfrac{2}{5}-\left( 6\dfrac{3}{7}\right)^{-1}\right):\left(\dfrac{1}{50}-10^{-2}\right)$, because if that is the case, then your answer isn't correct.

I know $LaTeX$ might be a foreign language for you, but it's really very easy to learn how to type a simple mathematical expression using $LaTeX$, for starter, if you want to type $\dfrac{2}{5}$, you need to latex code of \dfrac{2}{5}, enclosed with a pair of the dollar signs. If you want $10^2$, you just type 10^2, enclosed it with a pair of the dollar signs but if the exponent consists of more than two "characters", just as in $10^{-2}$, you need to put the pair of curly braces{} around the exponent.

Do you want to take a stab at it and re-post your last two questions here?

 

[MarkFL]

If its not problem for you to check these last two. I got no more of these...

I have moved your new questions into a new thread. We ask that new questions be posted in a new thread as tagging new question onto an existing thread can make the thread become convoluted and hard to follow. :D

 

[Alexstrasuz1]

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Done in word

 

[Opalg]

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Done in word

I agree with your answers, $20/3$ and $-20/3$.