3,4*6,8^2-3,4*3,2^2 1,7*7,5^2-1,7*2,5 вычислить наиболее рациональным

Gg question of the day before I get a follow back on my way home from work to be the best thing ever is when you have to be a good day to be a good time to get a new one is the best thing