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vuvanquan174
2 năm trước
Cho hàm số y = f(x)= kx (k là hằng số, k≠0) Chứng minh a) f(10x) = 10f(x) b)f(x1+x2) = f(x1) + f(x2) c) f(x1-x2) = f(x1) - f(x2)
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