递等式计算,能简便的简便计算.

递等式计算,能简便的简便计算.
3.68×【1÷（2.1-2.09）】4分之41-3分之5×6+12分之1 375+450÷18×25
=
=
=
（5分之4+4分之1）÷3分之7+10分之7 （54+13分之9）÷9276×7分之2÷27.6
=
=
=
3.4-8.4×4分之1+1.6÷5分之42.9×995.87+3.4-0.87+1.6
=
=
=
0.4×1.25×25×817.5-4.25.5.75 0.125×0.25×32
=
=
=
（6.3-6.3×0.9）÷6.3 9.7÷1.25÷0.8 （20分之7+50分之11+25分之6）÷5分之2
=
=
=
168.8÷（24.3×2-6.4）7.25-3又7分之3+3.75-6又7分之4
=
=
=
0.625×5.8+8分之5×3.2+8分之5
=
=
=