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简便计算下面各题.44×0.25       &n

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/17 19:56:19
简便计算下面各题.
44×0.25            
1
15
(1)44×0.25,
=11×4×0.25,
=11×(4×0.25),
=11×1,
=11;
(2)(
1
15+
2
17)×15×17,
=
1
15×15×17+
2
17×15×17,
=17+30,
=47;
(3)85.57-(5.57-3.8),
=85.57-5.57+3.8,
=80+3.8,
=83.8;
(4)99999×77778+33333×66666,
=99999×77778+33333×(3×22222),
=99999×77778+99999×22222,
=99999×(77778+22222),
=99999×100000,
=9999900000;
(5)27×
136
137+136×
20
137+180×
68
137,
=27×136×
1
137+136×20×
1
137+180×68×
1
137,
=27×136×
1
137+136×20×
1
137+90×136×
1
137,
=(27+20+90)×136×
1
137,
=137×136×
1
137,
=136.