Question

[225-9×(80÷a+40)÷5]÷4+4=40 cineva are rezolvarea

Answer 1

Răspuns:

$(225 - 9 \times (80 \div a + 40) \div 5) \div 4 = 36 \\ 225 - 9 \times (80 \div a + 40) \div 5 = 144 \\ - 9 \times (80 \div a + 40) \div 5 = - 81 \\ (80 \div a + 40) \div 5 = 9 \\ 80 \div a + 40 = 45 \\ 80 \div a = 5 \\ a = 400$