Упростите выражения 4a+90a 86b-77b 209m+m 302n-n

4 a + 90 a = 4 * a + 90 * a = a * (4 + 90) = 94 * a = 94 a;

86 b - 77 b = 86 * b - 77 * b = b * (86 - 77) = 9 * b = 9 b;

209 m + m = 209 * m + m = m * (209 + 1) = 210 * m = 210 m;

302 n - n = 302 * n - n = n * (302 - 1) * n = 301 * n = 301 n.