1) 840 : (2 * 7) = 840 : 14 = 60
2) 6 300 : (900 : 9) = 6 300 : 100 = 63
3) 15 * 6 * 25 * 4 = 90 * 25 * 4 = 2 250 * 4 = 9 000
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1) 840 : (2 * 7) = 840 : 14 = 60
2) 6 300 : (900 : 9) = 6 300 : 100 = 63
3) 15 * 6 * 25 * 4 = 90 * 25 * 4 = 2 250 * 4 = 9 000