3又4分之3乘2.84除以3又5分之3除以（1又2

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3又4分之3乘2.84除以3又5分之3除以（1又2分之1乘1.42）乘1又五分之4
=15／4 × 2.84 × 5／18 ÷ ﹙3／2 ×1.42﹚× 9／5
=15×0.71× 5／18 × 1／﹙3×0.71﹚ × 9／5
=5／2
＝2.5