нок (3;4)=3*4=12
1/4+1/3=3/12+4/12=7/12
1/4-1/3=3/12-4/12=-1/12
нок(3,4)=12
а)3/12+4/12=7/12
б)3/12-4/12=-1/12
нок (3;4)=3*4=12
1/4+1/3=3/12+4/12=7/12
1/4-1/3=3/12-4/12=-1/12
нок(3,4)=12
а)3/12+4/12=7/12
б)3/12-4/12=-1/12