Question

15乘以2等于30,5乘以6等于30,用着两道算式紸成比例,有多少个

Answer 1

15X2=30X1
15:30=1:2
15:1=30:2
2:30=1:15
2:1=30:15
5X6=30X1
5:30=1:6
5:1=30:6
6:30=1:5
6:1=30:5