41.2*8.1+11*9又1/4+537*0.19=

问题描述:

41.2*8.1+11*9又1/4+537*0.19=

原式= 41.2*(10—1.9)+ 11*(10—0.75)+537*0.19
=(537—412)*0.19 + 412 + 110—11*0.25*3
= 125*0.19 + 412 + 110 —11*0.25*3
=0.25*(19*5-11*3)+412+ 110
=537.5