Вычислите a)8/9*3/4-(5/6-1/4) б,)3/5+4/5*3/7+6/7 - вопрос №539337089345614354537672527272550 от komarenko 07.01.2021 22:10

Question

Математика: Вычислите a)8/9*3/4-(5/6-1/4) б,)3/5+4/5*3/7+6/7 в) (2/5-2/7): 2 / 7*2/5 дая 50 .

komarenko · Answer

a) 8/9 * 3/4 - (5/6 - 1/4) = = 2/3 - (10/12 - 3/12) = 2/3 - 7/12 = 8/12 -- 7/12 = $\frac{1}{12}$

б) 3/5 + 4/5 * 3/7+ 6/7 = 3/5 + 12/35 + 6/7 = 21/35 + 12/35 + 30/35 = = 63/35 = 1 $\frac{28}{35}$ =
= 1 $\frac{4}{5}$

в) (2/5 - 2/7) : 2 / 7*2/5= (14/35-10/35):2/14/5= 4/35*1/2/14/5= $\frac{2*5}{35*14}$ =1/49