Question: the superscript is always changing,and the expression is not ideal.

question1:When I Input a complex expression,the superscript is sometimes acceptable

I copy a good-form letter with superscript to the destination box,but the superscript is too high,a little far away the letter,and in the whole expression,they're not the same form!

How to solve it?

question2:

I'd like the expression (a[1]+a[2])/2 become the form (a1+a2)/2,but it comes a[1]/2+a[2]/2,and I can't let it become the form I like with right-click menus.How to reach it?

 

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