脱式计算，能简算的必须简算．0.25×1.25×326.75×2.9+42.5×0.29-2.978÷[（35+110）×54]35.6-1.8-15.6-7.21999+999×9990.5×[515÷（3-2.5×78）]．

Question

脱式计算，能简算的必须简算．
0.25×1.25×32          　　　　　  
6.75×2.9+42.5×0.29-2.9
(7)/(8)÷[（(3)/(5)+(1)/(10)）×(5)/(4)]
35.6-1.8-15.6-7.2
1999+999×999                      
0.5×[5(1)/(5)÷（3-2.5×(7)/(8)）]．

Answer 1

（1）0.25×1.25×32
=0.25×1.25×（4×8）
=（0.25×4）×（1.25×8）
=1×10
=10；

（2）6.75×2.9+42.5×0.29-2.9
=6.75×2.9+4.25×2.9-2.9
=（6.75+4.25-1）×2.9
=10×2.9
=29；

（3）(7)/(8)÷[（(3)/(5)+(1)/(10)）×(5)/(4)]
=(7)/(8)÷[(7)/(10)×(5)/(4)]
=(7)/(8)÷(7)/(8)
=1；

（4）35.6-1.8-15.6-7.2
=（35.6-15.6）-（1.8+7.2）
=20-9
=11；

（5）1999+999×999
=（1000+999）+999×999
=1000+999×（1+999）
=1000+999×1000
=1000×（1+999）
=1000×1000
=1000000；

（6）0.5×[5(1)/(5)÷（3-2.5×(7)/(8)）]
=0.5×[5(1)/(5)÷（3-(35)/(16)）]
=0.5×[5(1)/(5)÷(13)/(16)]
=0.5×(32)/(5)
=3.2．