Объяснение:
а) 7 * 239 + 11 * 39 - 6 * 239 - 12* 39 = 39 * (11 - 12) + 239 * (7 - 6) =
= 239 - 39 = 200
б) 7 * 630 + 6 * 137 - 6 * 630 + 4 * 137 = (7 - 6) * 630 + 10 * (137) =
= 630 + 1370 = 2000
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Объяснение:
а) 7 * 239 + 11 * 39 - 6 * 239 - 12* 39 = 39 * (11 - 12) + 239 * (7 - 6) =
= 239 - 39 = 200
б) 7 * 630 + 6 * 137 - 6 * 630 + 4 * 137 = (7 - 6) * 630 + 10 * (137) =
= 630 + 1370 = 2000