math 117

multiply and simplify
10b^6/3r^2 x 9r^7/100b

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  1. 10b^6 /(3r^2*9r^7/100b),
    10b^6/(27r^9/100b),
    Invert fraction and multiply:
    10b^6 * 100b/27r^9,
    1000b^7 / 27r^9.

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