Вычислите помогите пожалуйста г)2/5*15 д)1/4*4 е)5*1/5 г)3/7*2 1/3 д)1 1/3*1/2 б)3*5 1/4*1 1/7*5 1/2*4/11. Created by artemka2003g. matematika-ru

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artemka2003g @artemka2003g

September 2021 1 13 Report

Вычислите помогите пожалуйста
г)2/5*15 д)1/4*4 е)5*1/5

г)3/7*2 1/3 д)1 1/3*1/2

б)3*5 1/4*1 1/7*5 1/2*4/11

Answers & Comments

lily73 2/5 * 15 = (2*15)/5 = 30/5= 6
1/4 * 4 = 1*4/4 = 1
5* 1/5 = 5*1 /5 = 1
3/7 * 2 1/3 = 3/7 * 7/3 3*7/7*3 = 21/21 = 1
1 1/3 * 1/2 = 4/3 * 1/2 = 4 *1 / 3* 2 = 4/6 = 2/3
б) 3 * 5 1/4 = 3 * 21/4 = 63/4
63/4 * 1 1/7 = 63/4 * 8/7 = (63 *8)/ (4*7) = 504 / 28 = 18
18 * 5 1/2 = 18 * 11/2 = 198/2
198/2 * 4/11 = (198 *4)/ 2*11 = сокращаем 2 и 11 = 18 * 2 = 36

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