Tính :
\(\displaystyle {{9 \times 42} \over {14 \times 27}} =\; ...............\)
\(\displaystyle {{9 \times 42} \over {14 \times 27}} = {{\not 9 \times \not3 \times \not14} \over {\not14 \times \not3 \times \not9}} = 1\)
-- Mod Toán lớp 5
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