помогите 20 баллов
3: Вычислите:
а:46^2-92*31+31^2
б:37^2-23^2:
47^2-169
И задачу N4
3: Вычислите:
а:46^2-92*31+31^2
б:37^2-23^2:
47^2-169
И задачу N4
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Answers & Comments
1.
1) 46^2-92*31+31^2 = 46^2-2*46*31+31^2 =
= (46 - 31)^2 = 15^2 = 225
2) 37^2-23^2:47^2-169 = 37^2-23^2:47^2-13^2 = (37 - 23)(37 + 23):(47 - 13)(47 + 13)=
14*60:34*60 = 14:34 = 7/17