Đúng ghi Đ, sai ghi S?

a) 536 817 + 82 579 = 619 386	981 759 – 645 267 = 336 492
b) 64,38 + 93,46 = 157,84	86,09 – 54,3 = 31,79
c) \(\frac{4}{7} + \frac{3}{5} = \frac{{41}}{{35}}\)	\(\frac{{10}}{9} - \frac{5}{6} = \frac{5}{{18}}\)

Mẫu: \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{5746}\\{1962}\end{array}} \\\,\,\,3784\end{array}\)                                    Thử lại: \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{3784}\\{1962}\end{array}} \\\,\,\,\,5746\end{array}\)

a)               8 923 – 4 157

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27 069 – 9 537

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b)             \(\frac{8}{{15}} - \frac{2}{{15}}\)

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\(1 - \frac{3}{7}\)

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c)             7,284 – 5,596

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0,863 – 0,298

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