8/9-5/12= 7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20) =10/1
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/31 22:49:21
8/9-5/12= 7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20) =10/15-4/20 =
7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20) =10/15-4/20 = 是7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20)
=10/15-4/20
= (简算)
7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20) =10/15-4/20 = 是7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20)
=10/15-4/20
= (简算)
![8/9-5/12= 7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20) =10/1](/uploads/image/z/7890800-32-0.jpg?t=8%2F9-5%2F12%3D+7%2F15-3%2F20-1%2F20%2B3%2F15+%3D%EF%BC%887%2F15%2B3%2F15%EF%BC%89-%EF%BC%883%2F20%2B1%2F20%EF%BC%89+%3D10%2F1)
8/9-5/12=32/36-15/36=17/36
7/15-3/20-1/20+3/15
=(7/15+3/15)-(3/20+1/20)
=10/15-4/20
=10/15-1/5
=10/15-3/15
=7/15
7/15-3/20-1/20+3/15
=(7/15+3/15)-(3/20+1/20)
=10/15-4/20
=10/15-1/5
=10/15-3/15
=7/15
8/9-5/12= 7/15-3/20-1/20+3/15 =(7/15+3/15)-(3/20+1/20) =10/1
1+2+3=4+5-3 6+7+8+9=10+11+12-3 13+14+15+16+17=18+19+20+21-3
20个等式:1+2=3,4+5+6=7+8,9+10+11+12=13+14+15,省略,则第20
14/3乘12/7= 3/1乘3/1乘5/1= 15/2乘16/15乘20= 4/1乘24乘8/3= 7/5乘4/3乘9
1=5,2=10,3=15,4=20,5=?6=?7=?8=?9=?10=?
脑筋急转弯 1=5 ,2=10,3=15,4=20,5=?,6=30,7=35,8=40,9=45
10/21+(3/20+11/21)= 3/18+5/8-2/18= 7/15-1/5= 2/3-1/3+1/6= 1-
1+1/3-7/12+9/20-11/30+13/42-15/56=?
1又1/3+7/12+9/20-11/30+13/42-15/56=?
1 1/3-7/12+9/20-11/30+13/42-15/56= (写出主要过程)
1+2=3,4+5+6=7+8,9+10+11+12=13+14+15,第20组数的等号两边和是多少?
1+2=3,4+5+6=7+8,9+10+11+12=13+14+15一直家到20