脱式计算，能简算的要简算．①2.55÷1.7-0.59②3.7×7.9+3.7×2.1③37×﹙45-23）÷514④34×93+6×0.75+75%

Question

脱式计算，能简算的要简算．
①2.55÷1.7-0.59     ②3.7×7.9+3.7×2.1     ③(3)/(7)×﹙(4)/(5)-(2)/(3)）÷(5)/(14)     ④(3)/(4)×93+6×0.75+75%

Answer 1

①2.55÷1.7-0.59
=1.5-0.59
=0.91；
     
②3.7×7.9+3.7×2.1    
=3.7×（7.9+2.1）
=3.7×10
=37；

③(3)/(7)×﹙(4)/(5)-(2)/(3)）÷(5)/(14)   
=(3)/(7)×(2)/(15)×(14)/(5)  
=(4)/(25)；

④(3)/(4)×93+6×0.75+75%
=0.75×93+6×0.75+0.75
=0.75×（93+6+1）
=0.75×100
=75．