Помогите решить 2) пример
= 3/10 - 1/5 + 5/12 = (18-12+25)/60 = 31/60
69/70×7/23-4/25÷4/5+3/5×25/36=31/60 1) 69/70×7/23=3/10 2) 4/25÷4/5=1/5 3)3/5×25/36=5/12 4) 3/10-1/5=1/10 5) 1/10+5/12=6/60+25/60=31/60