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Mathematics, 26.09.2021 14:00 dxpebetty64

Giải phương trình vi phân cấp 2 ạ b) y"+ (m+ a + 2)y- (m+ a + 3)y= (x + a + 3)cos(m+3)x

c) y"+ (n + 2)y (n + 3)y= (m+b)x - (a + n)

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