Math help

How do you do these two problems?

1. -�ã338-�ã200+�ã162=_______

2. 2a2^b�ã363a6^b3^c5^=_____

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  1. Assuming ã means √,

    √338-√200+√162
    = √169√2 - √100√2 + √81√2
    = 13√2-10√2+9√2
    = 12√2

    Do the other in the same way: extract perfect roots, and combine the other factors under a single √

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