Quy đồng mẫu các phân số:
a. \(\frac{{ - 4}}{7},\frac{8}{9},\frac{{ - 10}}{{21}}\) b,\(\frac{5}{{{2^2}.3}},\frac{7}{{{2^3}.11}}\)
Câu a:
\(\frac{{ - 36}}{{63}},\frac{{56}}{{63}},\frac{{ - 36}}{{63}}\)
Câu b:
\(\frac{{110}}{{264}},\frac{{21}}{{264}}\)
-- Mod Toán 6
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