(5.6×3×1.7×0.9)÷(51×0.14×4×18)=?(15\56-13\42+11\30-9\20+7\12
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/10 06:27:41
(5.6×3×1.7×0.9)÷(51×0.14×4×18)=?(15\56-13\42+11\30-9\20+7\12-1\3)×2.005×390
﹙5.6×3×1.7×0.9﹚÷﹙51×0.14×4×18﹚
=﹙ 0.56÷0.14﹚×﹙3×17÷51﹚×﹙0.9÷18﹚÷4
=4×1÷4×0.05
=0.05
﹙15/56-13/42+11/30-9/20+7/12-1/3﹚×2.005×390
=﹙1/7+1/8-1/6-1/7+1/5+1/6-1/4-1/5+1/+1/4-1/3﹚×2.005×390
=﹙1/8-1/3﹚×2.005×390
=﹣5/24×2.005×390
=523/160
再问: “﹙1/7+1/8-1/6-1/7+1/5+1/6-1/4-1/5+1/+1/4-1/3﹚×2.005×390”少了一个数
=﹙ 0.56÷0.14﹚×﹙3×17÷51﹚×﹙0.9÷18﹚÷4
=4×1÷4×0.05
=0.05
﹙15/56-13/42+11/30-9/20+7/12-1/3﹚×2.005×390
=﹙1/7+1/8-1/6-1/7+1/5+1/6-1/4-1/5+1/+1/4-1/3﹚×2.005×390
=﹙1/8-1/3﹚×2.005×390
=﹣5/24×2.005×390
=523/160
再问: “﹙1/7+1/8-1/6-1/7+1/5+1/6-1/4-1/5+1/+1/4-1/3﹚×2.005×390”少了一个数
(5.6×3×1.7×0.9)÷(51×0.14×4×18)=?(15\56-13\42+11\30-9\20+7\12
4/3-7/12+9/20-11/30+13/42-15/56=(用简便方法)
简便计算 1又1/3-7/12+9/20-11/30+13/42-15/56
5/6-7/12+9/20-11/30+13/42-15/56+17/72,
简便计算:4/3-7/12+9/20-11/30+13/42-15/56=?
计算.2分之3-6分之5+12分之7-20分之9+30分之11-42分之13+56分之15
(12分之7-20分之9+30分之11-42分之13+56分之15)×24
2\3-6\2+12\7-20\9+30\11-42\13+56\15 (简算)
1又3分之1-12分之7+20分之9-30分之11+42分之13-56分之15 要简算,
1 1/3-7/12+9/20-11/30+13/42-15/56= (写出主要过程)
1+2/1-6/5+12/7-20/9+30/11-42/13+56/15-72/17=?
4/3+7/12-9/20+11/30-13/42+15/56简便运算