Question

Afla valoarea numerica a literei a. 72÷a=8.a÷7=8. 32÷a=4. a÷a=1.0÷a=0. (A÷4)+42=51. (7×a)+21=70. 90-(6×a)=36. 24+(8×a)=72. (63÷a)+36=45

Answer 1

72÷a=8 = > a= 72:8 = 9
a : 7 = 8 => a= 7 * 8 = 56
32 : a = 4 =? a= 32:4 = 8
a : a = 1 => a=a, a numar oarecare
0 : a = 0 => a număr oarecare
(a:4) + 42 = 51 => a : 4 = 51 - 42 =>  a : 4 = 9 => a = 9 *4 => a=36
(7*a) + 21 = 70 => 7 * a = 70 - 21 => 7*a = 49 => a = 49:7 = 7
90-(6*a) = 36 =>6*a = 90 - 36 => 6 *a = 54 => a = 54:6 = 9
24+(8*a) = 72 => 8 *a = 72 - 24 => 8 * a = 48 => a= 48:8=6
(63:a) + 36 = 45 => 63: a = 45 - 36 => 63 : a = 9 => a= 63:9=7 

Answer 2

72:a=8
a=72:8
a=9

a:7=8
a=7•8
a=56

32:a=4
a=32:4
a=8

a:a=1
a=1

0:a=0
a=0

(a:4)+42=51
a:4=51-42
a:4=9
a=4•9
a=36

(7•a)+21=70
7•a=70-21
7•a=49
a=49:7
a=7

90-(6•a)=36
6•a=90-36
6•a=54
a=54:6
a=9

24+(8•a)=72
8•a=72-24
8•a=48
a=48:8
a=6

(63:a)+36=45
63:a=45-36
63:a=9
a=63:9
a=7

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