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$$14 \cdot 60 = 840$$
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$$29 \cdot 30 = 870$$
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$$240+ 22 \cdot 30 = 240 + 660 = 900$$
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$$900- 18 \cdot 50 = 900 - 900 = 0$$
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$$1000 - (23 \cdot 40 - 570:3) = 1000 - (920 - 190) = 1000 - 730 = 270$$
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$$(850-12 \cdot 70) \cdot 10:25 = (850 - 840) \cdot 10 : 25 = 10 \cdot 10 : 25 = 100 : 25 = 4$$
Ответ: 840, 870, 900, 0, 270, 4