Помогите решить 3/7*(1/4+4/9) 4/5-1/4:5/6

Question

Помогите решить 3/7*(1/4+4/9)
4/5-1/4:5/6

Answer 1

А)3/7*(1/4+4/9)=3/7*(9/36+16/36)=3/7*25/36=25/84
б)4/5-1/4:5/6=4/5-1/4*6/5=4/5-3/10=8/10-3/10=5/10=1/2