Помогите пожалуйста!!Вычислить: а) 3 1/8+ 2 1/12 - 1/3 / 7,3-0,4*8,5б) 12*0,8-1,8 / 2 1/2 + 2 1/15 - 1/4. Created by lariska456. matematika-ru

А) 3 1/8 + 2 1/12 - 1/3 = 3 3/24 + 2 2/24 - 8/24 = 5 5/24 - 8/24 = 4 21/24 = 4 7/87,3 - 0,4 * 8,5 = 7,3 - 3,4 = 3,94 7/8 : 3,9 = 39/8 * 10/39 = 10/8 = 5/4 = 1 1/4 = 1,25б) 12 * 0,8 - 1,8 = 9,6 - 1,8 = 7,82 1/2 + 2 1/15 - 1/4 = 2 30/60 + 2 4/60 - 15/60 = 4 34/60 - 15/60 = 4 19/607,8 : 4 19/60 = 7 8/10 : 259/60 = 7 4/5 * 60/259 = 39/5 * 60/259 = 468/259 = 1 199/259

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lariska456 @lariska456

October 2021 1 8 Report

Помогите пожалуйста!!
Вычислить:
а) 3 1/8+ 2 1/12 - 1/3 / 7,3-0,4*8,5
б) 12*0,8-1,8 / 2 1/2 + 2 1/15 - 1/4

Answers & Comments

enoilsantas А) $\frac{3 \frac{1}{8}+2 \frac{1}{12}- \frac{1}{3} }{7,3-0,4*8,5}=1,25$
3 1/8 + 2 1/12 - 1/3 = 3 3/24 + 2 2/24 - 8/24 = 5 5/24 - 8/24 = 4 21/24 = 4 7/8
7,3 - 0,4 * 8,5 = 7,3 - 3,4 = 3,9
4 7/8 : 3,9 = 39/8 * 10/39 = 10/8 = 5/4 = 1 1/4 = 1,25

б) $\frac{12*0,8-1,8}{2 \frac{1}{2}+2 \frac{1}{15}- \frac{1}{4}} =1 \frac{199}{259}$
12 * 0,8 - 1,8 = 9,6 - 1,8 = 7,8
2 1/2 + 2 1/15 - 1/4 = 2 30/60 + 2 4/60 - 15/60 = 4 34/60 - 15/60 = 4 19/60
7,8 : 4 19/60 = 7 8/10 : 259/60 = 7 4/5 * 60/259 = 39/5 * 60/259 = 468/259 = 1 199/259

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