【1】2比0.7=x比2又8分之5
0.7x=2×2又5/8
0.7x=5.25
x=7.5
【2】4分之3x－0.95×4=8又2分之1
3/4x-3.8=8.5
3/4x=12.3
x=16.4
【3】9003－5544÷18×27
=9003-308×27
=9003-8316
=687
【4】﹙4.8－4.8×6分之5﹚÷1又3分之1
=4.8×（1-5/6）÷4/3
=4.8×1/6÷4/3
=0.8×3/4
=0.6
【5】2.4×[3又5分之4÷﹙3－2.4×15分之4﹚]
=2.4×[3又4/5÷（3-0.64）]
=2.4×[3.8÷2.36]
=2.4×95/59
=228/59
=3又51/59
【6】﹙4又7分之4－1又14分之11﹚÷﹙7分之4＋3分之2﹚×6分之5
=2又11/14÷26/21×5/6
= 39/14×21/26×5/6
=9/4×5/6
=15/8
=1又7/8