Question

afla necunoscuta 120-5xa-4*7=57
a*7-3*4+8*6=64
(a*6-6*6):2+81:9=3*7
42:6*7-a*8=17
a:8+6*6+21:3=51​

Answer 1

Răspuns:

a1=29rest4

a2=17rest5

a3=10

a4=8rest2

a5=64

Explicație pas cu pas:

120-5×a-4×7=57

120-5×a-28=57

120-5×a=57-28

120-5×a=29

5×a=120+29

5×a=149

a=149:5

a=29 rest 4

a×7-3×4+8×6=64

a×7-12+48=64

a×7-60=64

a×7=64+60

a×7=124

a=124÷7

a=17rest5

(a×6-6×6)÷2+81÷9=3×7

(a×6-36)÷2+9=21

(a×6-36)÷2=21-9

(a×6-36)÷2=12

a×6-36=12×2

a×6-36=24

a×6=24+36

a×6=60

a=60÷6

a=10

42÷6×7-a×8=17

7×7--a×8=17

a×8=17+49

a×8=66

a=66÷8

a=8rest2

a÷8+6×6+21÷3=51

a÷8+36+7=51

a÷8+36=51-7

a÷8+36=44

a÷8=44-36

a÷8=8

a=8×8

a=64

Sper ca te-am ajutat! Baftă !

Coroana?