脱式计算（能简算的要简算）①l+O.64÷0.8-0.15②211×[34-（716-38）]③25×18+32×25④15÷[（23+1

Question

脱式计算（能简算的要简算） ①l+O.64÷0.8-0.15	② (2)/(11) ×[ (3)/(4) -（ (7)/(16) - (3)/(8) ）]
③ (2)/(5) ×18+32× (2)/(5)	④ (1)/(5) ÷[（ (2)/(3) + (1)/(5) ）× (1)/(13) ]．

Answer 1

①l+O.64÷0.8-0.15，
=1+0.8-0.15，
=1.8-0.15，
=1.65；

② (2)/(11) ×[ (3)/(4) -（ (7)/(16) - (3)/(8) ）]，
= (2)/(11) ×[ (3)/(4) - (1)/(16) ]，
= (2)/(11) × (11)/(16) ，
= (1)/(8) ；

③ (2)/(5) ×18+32× (2)/(5) ，
= (2)/(5) ×（18+32），
= (2)/(5) ×50，
=20；

④ (1)/(5) ÷[（ (2)/(3) + (1)/(5) ）× (1)/(13) ]，
= (1)/(5) ÷[ (13)/(15) × (1)/(13) ]，
= (1)/(5) ×15，
=3．