please calculation:
a. [(1.456+ 4.579)-2.859:3]*10=
b. [(975:5)+(421.111-421.086)]: (27.590-27.580)]=
c.70.000-(57.700:100+32*41:4:8 +1.382):1.000=
d.820.032-[(328.342-263.127)*11]+7.059*4=