1/12+1/18+5/18+3/12 помогите

= ( 1/12 + 3/12 ) + ( 1/18 + 5/18 ) = 4/12 + 6/18 = 1/3 + 1/3 = 2/3

3/36+2/36=5/36 10/36+9/36=19/36 5/36+19/36=24/36=8/12=2/3