四分之三乘2.84除以三又五分之三除以(一又二分之一乘1.42）乘一又五分之四
=3/4×2.84×5/18×2/3÷1.42×9/5
=3/4×2/3×5/18×9/5×2.84÷1.42
=1/2×1/2×2
=1/2