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