√ ({(5.5× 2.3)× √ (728.91))} = 3(1/7)÷ ?/28
√ ({(5.5× 2.3)× √ (728.91))} = 3(1/7)÷ ?/28 √ ({(6× 2)× √ (729))} = 3(1/7)÷ ?/28 √ (12× 27) = 22/7× 28/? =>√ 324 = 88/? => 18 = 88/? => ? = 4.888 = 5
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