Ответы на вопрос:
287^2-287*48+239*713 = 287*(287-48) + 239*713 = 287 * 239 + 239*713 = 239*(287+713)=239*1000 = 239000 ============================================== 73.4^2+73.4*17.2-90.6*63.4 = 73.4*(73.4 + 17.2) = 73.4 * 90.6 - 90.6 * 63.4 = 90.6*(73.4-63.4)=90.6*10=906
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