# 72
1) 1кг = 1000г
80г = 80/1000 = 8/100 = 1/25
400г = 400/1000 = 4/10 = 2/5
750г = 750/1000 = 75/100
2) 1м = 100см
25см = 25/100 = 1/4
50см = 50/100 = 1/2
90см = 90/100 = 9/10
3) 1м(2) = 100дм(2)
8дм(2) = 8/100 = 2/25
55дм(2) = 55/100
72дм(2) = 72/100
#73, 74 и 76 не знаю
#75
2*3*5 = 30