А) (49²+49)+(50²-50) = (2401+49) + (2500-50) = 2450 + 2450 = 4900Б) (25²+25)-(24²+24) = (625+25) - (576+24) = 650 - 600 = 50В) 20•19-19•18+18•17-17•16 = 380 - 342 + 306 - 272 = 72 + 306 - 272 = 106Г) 26•25-25•24+24•23-23•22 = 650 - 600 + 552 - 506 = 50 + 46 = 96
А) (49²+49)+(50²-50) = (2401+49) + (2500-50) = 2450 + 2450 = 4900
Б) (25²+25)-(24²+24) = (625+25) - (576+24) = 650 - 600 = 50
В) 20•19-19•18+18•17-17•16 = 380 - 342 + 306 - 272 = 72 + 306 - 272 = 106
Г) 26•25-25•24+24•23-23•22 = 650 - 600 + 552 - 506 = 50 + 46 = 96