\(\frac{5}{9}x\frac{9}{5}=\frac{5x9}{9x5}=\frac{45}{45}=1\)
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\(\frac{5}{9}x\frac{9}{5}=\frac{5x9}{9x5}=\frac{45}{45}=1\)
\(\frac{5}{9}x\frac{9}{5}=1\)k nhaaaaaaaaaaaaaaaaaaa
\(\frac{5}{9}\times\frac{9}{5}=\frac{5\times9}{9\times5}=\frac{45}{45}=1\)
\(\frac{5}{9}\cdot\frac{9}{5}=\frac{1\cdot1}{1\cdot1}=1\)