Question

[1 pe 15 plus 1 pe 21 plus 1 pe 20 ] ÷ 1 intreg si 2 pe 21. PE INSEAMNA LINIE DE FRACTIE. AJUTATIMA

Answer 1

[1/15 + 1/21 + 1/20] : 1 2/21= 1/15 +1/21 + 1/20]:23/21=

aflam numitorul comun

15=3x5

21=3x7

20=2^2x 5 (2 la a 2 ori 5)

c.m.m.mc [15.20.21]=3x5x4x7=420

420:15=28

420:20=21

420:21=20

vom amplifica fractiile

[1/15 + 1/21 + 1/20] : 1 2/21= 1/15 +1/21 + 1/20]:12/21=[28/420 +20/420 +21/420] : 240/420=28+20+21 / 420 : 240/420=69 / 420 : 240/420=69 / 420 x420 / 240=69 x 420 / 420x240 = 28980 / 100800 simplificam cu 10

=2898 / 10080 simplific cu 9

=322 / 1120 simplific cu 2

=161 / 560