(3 - 3/20)(2 + 3/20) + (5 - 3/20)(6 - 3/20) = (2 20/20 - 3/20)(1 20/20 + 3/20) + (4 20/20 - 3/20)(5 20/20 - 3/20) = 2 17/20 × 2 3/20 + 4 17/20 × 5 17/20 = 57/20 × 43/20 + 97/20 × 117/20 = 2451/400 + 11329/400 = (2451 + 11329)/400 = 13780/400 = 34 180/400 = 34.45
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Представили числа за х и у
х+у=12
х^2+у^2=74
х=12-у
(12-у)^2+у^2=74
144-24у+у^2+у^2=74
2у^2-24у+70=0
у^2-12у+35=0
у1=5; у2=7
х1=12-5=7; х2=12-7=5
Ну вроде будет так t=(v-v)/a