Question

脱式计算（能简算就用简便方法计算）8.5+1.5×2+1÷0.4 6.9×3.6-4.84÷0.4  ...

脱式计算（能简算就用简便方法计算）8.5+1.5×2+1÷0.4 6.9×3.6-4.84÷0.4 4.75+8.4÷（9.2-6.8）1.25×64 1.9×2.34+1.9×7.66．

Answer 1

（1）8.5+1.5×2+1÷0.4
=8.5+3+2.5 
=（8.5+2.5）+3
=11+3
=14
   
（2）6.9×3.6-4.84÷0.4
=24.84-12.1
=12.74
    
（3）4.75+8.4÷（9.2-6.8）
=4.75+8.4÷2.4
=4.75+3.5
=8.25

（4）1.25×64
=（1.25×8）×8
=10×8
=80
   
（5）1.9×2.34+1.9×7.66
=1.9×（2.34+7.66）
=1.9×10
=19