Question

简便计算：5/9×7/12+5/12÷7/5 九分之五乘十二分之七加十二分之五除五分之七

Answer 1

5/9×7/12+5/12÷7/5
=5/9×7/12+5/12×5/7
=5/12(7/9+5/7)
=5/12*93/63
=5/12*31/21
=155/252