а) 25/28 - 18/35 = 625/700 - 504/700 = 121/700
б) 40/63 - 35/72 = 640/1008 - 490/1008 = 150/1008 = 25/168
в) 22/21 - 21/22 = 44/42 - 21/22 = 22/21 - 21/22 = 1/66
г) 140/143 - 41/156 = 21860/20308 - 7163/20308 = 14697/20308
д) 43/126 - 41/135 = 5735/6804 - 6084/6804 = -349/6804
е) 239/240 - 229/288 = 68520/69120 - 62955/69120 = 5565/69120
а) 25/28 - 18/35 = 625/700 - 504/700 = 121/700
б) 40/63 - 35/72 = 640/1008 - 490/1008 = 150/1008 = 25/168
в) 22/21 - 21/22 = 44/42 - 21/22 = 22/21 - 21/22 = 1/66
г) 140/143 - 41/156 = 21860/20308 - 7163/20308 = 14697/20308
д) 43/126 - 41/135 = 5735/6804 - 6084/6804 = -349/6804
е) 239/240 - 229/288 = 68520/69120 - 62955/69120 = 5565/69120