Question:যদি x = 5a + 7b + 9c, y = b - 3a - 4c, z = c - 2b + a হয় তবে - ক. x +y = কত ? খ. ( x + y + z) - 6 (b + c) = কত ? গ. x - y + z = কত ?
Answer ক. দেওয়া আছে, x = 5a + 7b + 9c, y = b - 3a - 4c, z = c - 2b + a :. x + y = 5a + 7b + 9c + b - 3a - 4c = 5a - 3a + 7b + b + 9c - 4c = 2a + 8b + 5c খ. x + y + z - 6 (b + c) = 2a + 8b + 5c + c - 2b + a - 6 (b + c) [ক হতে x + y এর মান বসিয়ে ] = 2a + a + 8b - 2b + 5c + c - 6b - 6c = 3a + 6b + 6c - 6b - 6c = 3a গ. x - y + z = 5a + 7b + 9c - (b - 3a - 4c) + c - 2b + a = 5a + 7b + 9c - b + 3a + 4c + c - 2b + a = 5a + 3a + a + 7b - b - 2b + 9c + 4c + c = 9a + 4b + 14c
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jodi x = 5a + 7b + 9c, y = b - 3a - 4c, z = c - 2b + a hoy tobe - ka. x +y = koto ? kh. ( x + y + z) - 6 (b + c) = koto ? ga. x - y + z = koto ?