Вычислите : 1) 287²-287·48+239·713 2) 73,4²+73,4·17,2-90,6·63,4 - вопрос №12872874823971327347341729066343483989 от kozinasofia2006 20.06.2022 02:37

Question

Алгебра: Вычислите : 1) 287²-287·48+239·713 2) 73,4²+73,4·17,2-90,6·63,4

kozinasofia2006 · Answer

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