Вправи 101 - 200 » 192

Розкрийте дужки і спростіть вирази. а. x – (2x + 7) = x – 2x – 7 = -x – 7; б. а – (4а + 8) = a – 4a – 8 = -3a – 8; в. 5s – (3s – 2) = 5s – 3s + 2 = 2s + 2; г. 4x – 5 – (1 – 2x) = 4x – 5 – 1 + 2x = 6x – 6; д. –2(x + 3) – 4(x – 5) = -2x – 6 – 4x + 20 = -6x + 14; е. 7,2(а – k) + 2,4(k – 2а) = 7,2a – 7,2k + 2,4k – 4,8a = 2,4a – 4,8k; ж. 3(2/9f + 4) – (12 – 1/3) = 2/3f + 12 – 12 + 1/3 = 2/3f + 1/3; з. 1/8(1000 – 16d) + 2d = 125 – 2d + 2d = 125.