Плз, напишите всё подробно : 3 а) 2ц3/4 - 1ц5/6 = б) 4ц2/5 + 3ц5/6= в)7ц5/12 -(1ц5/8+2ц1/24)

203/4 - 105/6= 609/12 - 210/12= 399/12=133/4=33,25

402/5+305/6 = 2412/30 + 1525/30 = 3937/30

705/12 - (105/8 + 201/24 ) = 1) 105/8+201/24 = 315/24+201/24 =516/24=172/8=43/2

                                            2)705/12-43/2=705/12-258/12=447/12=37,25