Question

75-{6•[3+(a+3):2-7]-3}:5=30​

Answer 1

75 - { 6 × [ 3 + ( a + 3 ) : 2 - 7 ] - 3 } : 5 = 30

{ 6 × [ 3 + ( a + 3 ) : 2 - 7 ] - 3 } : 5 = 75 - 30

{ 6 × [ 3 + ( a + 3 ) : 2 - 7 ] - 3 } : 5 = 45

6 × [ 3 + ( a + 3 ) : 2 - 7 ] - 3 = 45 × 5

6 × [ 3 + ( a + 3 ) : 2 - 7 ] - 3 = 225

6 × [ 3 + ( a + 3 ) : 2 - 7 ] = 225 + 3

6 × [ 3 + ( a + 3 ) : 2 - 7 ] = 228

3 + ( a + 3 ) : 2 - 7 = 228 : 6

3 + ( a + 3 ) : 2 - 7 = 38

3 + ( a + 3 ) : 2 = 38 + 7

3 + ( a + 3 ) : 2 = 45

( a + 3 ) : 2 = 45 - 3

( a + 3 ) : 2 = 42

a + 3 = 42 × 2

a + 3 = 84

a = 84 - 3

a = 81

Answer 2

Răspuns:

75-{6•[3+(a+3):2-7]-3}:5=30​

{6•[3+(a+3):2-7]-3}:5=75-30

6•[3+(a+3):2-7]-3=45·5

6•[3+(a+3):2-7]=225+3

3+(a+3):2-7=228:6

(a+3):2=38+7-3

a+3=42·2

a=84-3

a=81