(6,7+5,66-3,7+4,34).(-76,6.1,2+7,66.1,2+7,66.12)
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Đáp án:
Giải thích các bước giải: \(\begin{array}{l}\left( {6,7 + 5,66 - 3,7 + 4,34} \right).\left( { - 76,6.1,2 + 7,66.1,2 + 7,66.12} \right)\\ = \left( {6,7 - 3,7 + 5,66 + 4,34} \right).\left( { - 7,66.10.1,2 + 7,66.1,2 + 7,66.12} \right)\\ = \left( {3 + 10} \right).\left( { - 7,66.12 + 7,66.1,2 + 7,66.12} \right)\\ = 13.\left( { - 7,66.12 + 7,66.12 + 7,66.1,2} \right)\\ = 13.\left( {0 + 7,66.1,2} \right)\\ = 13.9,192 = 119,496\end{array}\)
\[\begin{array}{l} \left( {6,7 + 5,66 - 3,7 + 4,34} \right)\left( { - 76,6.1,2 + 7,66.1,2 + 7,66.12} \right)\\ = \left[ {\left( {6,7 - 3,7} \right) + \left( {5,66 + 4,34} \right)} \right].\left( { - 7,66.12 + 7,66.12 + 7,66.1,2} \right)\\ = \left( {4 + 10} \right).7,66.1,2\\ = 14.7,66.1,2\\ = 14.\frac{{383}}{{50}}.\frac{6}{5} = \frac{{16086}}{{125}} = 128,688. \end{array}\]