Tính bằng cách hợp lí (nếu có thể):

Question

$begin mathsize 16px style a right parenthesis space left parenthesis negative 17 plus vertical line 91 vertical line thin space right parenthesis minus left parenthesis 91 minus vertical line minus 17 vertical line minus 2011 right parenthesis b right parenthesis space 4 over 7 plus 5 over 6 colon 5 minus 0 comma 375. left parenthesis negative 2 right parenthesis squared space c right parenthesis space left parenthesis fraction numerator negative 7 space over denominator 11 end fraction colon space 5 over 12 plus space fraction numerator negative 4 over denominator 12 end fraction colon 5 over 12 right parenthesis. fraction numerator 2. vertical line minus 5 vertical line over denominator 3 end fraction end style$

Tính bằng cách hợp lí (nếu có thể):

Giải thích

a) ( -17 + |91| ) – ( 91 – |-17| – 2011 ) = ( -17 + 91 ) – ( 91 – 17 – 2011 ) = - 17 + 91 – 91 + 17 + 2011 = ( - 17 + 17 ) + (91 – 91 ) + 2011 = 2011

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