Вычислите 72/156+34/156, 75/341-52/341, 34/105+62/105, 231/520-128/520.
72/156+34/156=106/156=53/78 75/341-52/341=23/341 34/105+62/105=96/105=32/35 231/520-128/520=103/520
72/156+34/156=106/156 75/341-52/341=23/341 34/105+62/105=96/105 231/520-128/520=103/520