7/8*4/9+4/9*1/8; 2(целых)2/9*3.7-2(целых)2/9*(-5.3); - вопрос №38370027849491822937229531121 от alina17anilaalina 28.08.2022 02:16

Question

Математика: 7/8*4/9+4/9*1/8; 2(целых)2/9*3.7-2(целых)2/9*(-5.3); (1(целых)1/2-1(целых)1/7)*14; (2/5-3/4)*20

alina17anilaalina · Answer

1)-7/8*4/9+4/9*1/8=4/9*(-7/5+1/8)=4/9*(-6/8)=-1/3

2) 2 2/9*3,7-2 2/9*(-5,3)=2 2/9*(3,7-(-5,3)=2 2/9*(3,7+5,3)=2 2/9*9=
=20/9*9=20

3) (1 1/2-1 1/7)*14=(3/2-8/7)*14=(10/14-16/14)*14=-6/14*14=-6

4)(2/5-3/4)*20=(8/20-15/20)*20=-7/20*20=-7