Question

十七分之七乘二十五分之十六加十七分之九乘二十五分之七用简便算法

Answer 1

7/17 x 16/25 + 9/17 x 7/25
=7x16/17x25 +9x7/17x25
=(7x16+9x7)/17x25
=7x(16+9)/17x25
=7x25/17x25
=7/17

Answer 2

(7/17)*(16/25)+(9/17)*(7*25)=(7/17)(16/25+9/25) = 7/17