80-20-50. 50-20+10 60-20+30 40-20-30 .

Question

80-20-50. 50-20+10 60-20+30 40-20-30 .

Comments

круто для 11 класса(((

Answer 1

80-20-50=60-50=10
50-30+10=30+10=40
60-20+30=40+30=70
40-20-30=20-30=-10