6/35: (4,8-3 3/7) (2 1/3-1 2/9): 4 3 1/3: 6-5,5*2 5/11 1 2/3: 5+0,175*20/7 1,75-1 11/7*51/56 - id54171720220912 от zemdy926 12.09.2022 09:17

Question

Математика: 6/35: (4,8-3 3/7) (2 1/3-1 2/9): 4 3 1/3: 6-5,5*2 5/11 1 2/3: 5+0,175*20/7 1,75-1 11/7*51/56

zemdy926 · Accepted Answer

А) числитель = x^2 -2x - 3 = x^2 - 1 - 2x - 2 = (x^2 - 1) - 2*(x+1) = = (x-1)*(x+1) - 2*(x+1) = (x+1)*(x-1 -2) = (x+1)*(x-3). знаменатель = x^2 + 2x + 1 = (x^2 + x) + (x+1) = x*(x+1) + (x+1) = (x+1)*(x+1). дробь = (x+1)*(x-3)/( (x+1)*(x+1) ) = [сокращаем на (x+1)] = (x-3)/(x+1). б) числитель = x^2 - 4x + 4 = x^2 - 2x - 2x + 4 = x*(x-2) - 2*(x - 2) = = (x-2)*(x-2). знаменатель = x^2 + 2x - 8 = x^2 - 2x + 4x - 8 = x*(x-2) + 4*(x-2) = = (x-2)*(x+4). дробь = (x-2)*(x-2)/( (x-2)*(x+4) ) = [сокращаем...

6/35: (4,8-3 3/7) (2 1/3-1 2/9): 4 3 1/3: 6-5,52 5/11 1 2/3: 5+0,17520/7 1,75-1 11/7*51/56

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