Question

2道简便计算和1道列式计算4/15×7/15×11（5/8+2/27）×8+11/27一个数的1/3是7/9,那么这个数

Answer 1

4/15×7/15×11

=308/225

(5/8+2/27)×8+11/27

=5/8×8+2/27×8+11/27

=5+(16/27+11/27)

=5+1

=6

7/9÷1/3×20%

=7/3×20%

=7/15