Сравните дроби: 9/14и14/21, 1/4и1/5, 5/8и1/2, 3/4и1/6, 1/6и1/4 найдите сумму 13/18и11/15, 3/5и4/7, 1/2и5/12, 7/8и5/6, 9/10и9/40 найти разность 5/12и3/8, 1/3и1/7, 7/12и1/4, 7/10и4/15, 8/9и1/4

9/14 (0.64 < 0.66)  14/21, 1/4(0.25 > 0.2) 1/5, 5/8( 0.625 > 0.5) 1/2, 3/4(0.75> 0.16) 1/6, 1/6(0.16< 0.25) 1/413/18и11/15 (0.7222222222+0.7333333333=1.46), 3/5и4/7(0.6+0.57=1.17), 1/2и5/12(0.5+0.42=0.92), 7/8и5/6(0.875+0.833=1.708), 9/10и9/40(0.9+0.225=1.125)разность5/12и3/8(0.417-0.375=0.042), 1/3и1/7(0.333-0.143=0.19), 7/12и1/4(0.583-0.25=0.333), 7/10и4/15(0.7-0.267=0.433), 8/9и1/4(0.889-0.25=0.639)