五分之二乘以百分之六十加上二十五分之十九乘以五分之二加上二十五分之十九乘以百分之六十等以多少?

依题可列式子：
2/5 * 60% + 19/25 * 2/5 + 19/25 * 60%
= 2/5 * 3/5 + 19/25 * 2/5 + 19/25 * 3/5
= 2/5 * 3/5 + 19/25 * （1-3/5）+ 19/25 * 3/5
= 2/5 * 3/5 + 19/25 - 19/25 * 3/5+ 19/25 * 3/5
= 2/5 * 3/5 + 19/25
= 6/25 + 19/25
= 1