4,000 - 1,000 = ?, 1,000,000 - ? = 500,000, 200 x 10 = ?, 80,000 / 2 = ?, 100 + 100 = ?, 200 / 4 = ?, 1,000 x ? = 5,000, 9,000 + 90,000 = ?, 1,900 - 900 = ?, Who is the best English teacher?.

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