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Tìm x
Bài 5*: Tìm x:
x 100 + x 200 + x 300 + x 400 + x 500 + x 520 = 2020 …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………