Plis help my 3,5,6,7.

48:4*3=36 отрезали 48-36=12 осталось -------------------------------- х+15=18+7 х=25-15 х=10 ---------------------- 24+х=10+21 х=31-24 х=7 ------------------- =(16/24+21/24-20/24)*(17/17-5/17)=17/24*12/17=1/2 ------------------------------------------------------------ (3 3/42-2 10/42)*0,6=(2 45/42-2 10/42)*3/5=5/6*3/5=1/2