Chứng minh a+5b chia hết cho 6 biết a-b chia hết cho 6

Cho : a ; b \(\in\) Z thỏa mãn : a - b \(⋮\) 6 . Chứng minh : a + 5b \(⋮\) 6

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Tính A=19/25(3/7+25/19)-3/7(19/25-7/3)

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