Дробь а) 3 — к знаменителю 8,20,100,1000 4 б)2 — к знаменителю 14,21,35,140 7 в)3 5 6 31 —, — к знаменителю 100; 2 4 5 25
227
464
Ответы на вопрос:
6/8, 15/20, 75/100, 750/100
4/14, 6/21, 10/35, 40/140
150/100, 125/100, 120/100, 124/100
5(х-3) = -2(х-4)+6 5х - 15 = - 2х + 8 + 6 5х + 2 х = 14 + 15 7х = 29 х = 29/7 х = 4 1/7 5 ( 4 1/7 - 3) = - 2 (4 1/7 - 4) + 6 5 * 1 1/7 = - 2 * 1/7 + 6 (5*8)/7 = - 2/7 + 6 40/7 = 5 5/7 5 5/7 = 5 5/7 9/10 * х = - 5 х = - 5 : 9/10 = - 5/1 * 10/9 х = - 50/9 х = - 5 5/9 9/10 * (-50/9) = - 5 -50/10 = -5 -5=-5 -3/7 * х = -27/49 х = - 27/49 : (-3/7) = - 27/49 * (-7/3) = (9 * 1) /(7*1) х = 9/7 - 3/7 * 9/7 = - 27/49 - 27/49 = - 27/49
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