7/8 + 1/6 divided by 2/9
3.9 x 10^25/4.259 x 10^26
(10^6)^2
(-19/5)x(41x(-5/19))
a^2-a
a-a^2
((3a)/(ax+ay))+((2a)/(ax+ay))
1234567890 : 1112
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<mfrac>
<mrow>
<msup>
<mi>a</mi>
<mn>2</mn>
...
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