Question

Ex 43,44,45, cine poate ex corect ex ms dau coroana

Answer 1

Răspuns:43:1225:[(13*a-30):3-10]=7

(13*a-30):3-10 = 1225:7

(13*a-30):3-10 = 175

(13*a-30):3 = 175+10

(13*a-30):3 = 185

13*a-30 = 185*3

13*a-30 = 555

13*a = 555+30

13*a = 585

a = 585:13

a = 45

44:

[(a+270:3)x5+100]=600x1

[(a+90)x5+100]=600

(a+90)x5=600-100

(a+90)x5=500

(a+90)=500:5

a+90=100

a=100-90

a=10

Explicație pas cu pas: