Question

Aflati-l pe,, a" din egalitățile
A: 3+2=80: 4
94: a-5=6×7
A: (120-2×55) -5=360: 10: 4
91: (a+6) +120: 10=75: 3
30: (a+3) +70: 2=82: 2
(36+a): 2+78: 2=2×32

Answer 1

a : 3+2=80 : 4

a : 3 = 20 - 2

a : 3 = 18

a = 18 × 3

a = 54

___________________

94 : a - 5 = 6 × 7

94 : a = 42 + 5

94 : a = 47

a = 94 : 47

a = 2

________________________

a : (120 - 2 × 55) - 5 = 360 : 10 : 4

a : ( 120 - 110 ) - 5 = 36 : 4

a : 10 - 5 = 9

a : 10 = 9 + 5

a = 14 × 10

a = 140

_____________________________

91 : (a+6) + 120 : 10 = 75 : 3

91 : ( a + 6) + 12 = 25

91 : ( a + 6) = 25 - 12

91 : ( a + 6) = 13

a + 6 = 91 : 13

a + 6 = 7

a = 7 - 6

a = 1

_______________________

30 : ( a + 3) +70 : 2=82 : 2

30 : ( a + 3) + 35 = 41

30 : ( a + 3 ) = 41 - 35

a + 3 = 30 : 6

a + 3 = 5

a = 5 - 3

a = 2

_______________________

(36 + a) : 2 + 78 : 2 =2 × 32

( 36 + a ) : 2 + 39 = 64

(36 + a ) : 2 = 64 - 39

36 + a = 25 × 2

36 + a = 50

a = 50 - 36

a = 14