Розвяжи з поясненнями двома способами 32-15 94-56 81-24 28-19 45-18

32-15=32-10-5=22-5=17

94-56=94-50-6=44-6=38

81-24=81-20-4=61-4=57

28-19=28-10-9=18-9=9

45-18=45-10-8=35-8=27

32-15 = (20+12) - (10+5) = (20-10) + (12-5) = 10+7=17

94-56 = (80+14) - (50+6) = (80-50) + (14-6) = 30+8=38

81-24 = (70+11) - (20+4) = (70-20) + (11-4) = 50+7=57

28-19 = (10+18) - (10+9) = (10-10) + (18-9) = 0+9=9

45-18 = (30+15) - (10+8) = (30-10) + (15-8) = 20+7=27