17*(3x-15)=0;0,25+1/4-1/3

17*(3x-15)=0;0,25+1/4-1/3

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  1. Giải thích các bước giải:

     a)17.(3x-15)=0

    3x-15=0:17

    3x-15=0

    3x=0+15

    3x=15

    x=15:3

    x=5

    b)0,25+$\dfrac{1}{4}$+$\dfrac{1}{3}$

    = $\dfrac{1}{4}$+$\dfrac{1}{4}$+$\dfrac{1}{3}$

    = $\dfrac{1}{2}$+$\dfrac{1}{3}$

    =$\dfrac{3}{6}$+$\dfrac{2}{6}$

    =$\dfrac{5}{6}$ 

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