Question

1. Rozwiąż równanie i sprawdź

1,4*a=7/8

2.Oblicz

420-20*3/4+1 1/3:1/3=

Answer 1

  1,4*a=7/8

14/10a = 7/8 /*10

14a = 35/4 /:14

a = 35/4 * 1/14

a = 5/8

 

Spr 14/10 * 5/8 = 14/16 = 7/8

 

420-20*3/4+1 1/3:1/3= 420 - 15 + 4/3 * 3 = 405 + 4 = 409