简便计算下面各题. 44×0.25 (1/15+2/17)×15×17 85.57-(5.57-3.8) 99999×77778+33333×66666 27×136/137+136×20/137+180×68/137.

问题描述:

简便计算下面各题.
44×0.25            

1
15
+
2
17
)×15×17           
85.57-(5.57-3.8)
99999×77778+33333×66666        
27×
136
137
+136×
20
137
+180×
68
137

(1)44×0.25,=11×4×0.25,=11×(4×0.25),=11×1,=11;(2)(115+217)×15×17,=115×15×17+217×15×17,=17+30,=47;(3)85.57-(5.57-3.8),=85.57-5.57+3.8,=80+3.8,=83.8;(4)99999×77778...