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Aflati numarul necunoscut:[(6×a+176)+129]:7=47,7×a=75-45+200:5.

Răspuns :

[ ( 6 × a + 176 ) + 129 ] : 7 = 47
[ 6 × a + 176 ) + 129 ] = 47 × 7
[ 6 × a + 176 ) + 129 ] = 329
6 × a + 176 = 329 - 129
6 × a + 176 = 200
6 × a = 200 - 176
6 × a = 24
a = 24 : 6
a = 4
7 × a = 75 - 45 + 200 : 5
7 × a = 75 - 45 + 40
7 × a = 30 + 40
7 × a = 70
a = 70 : 7
a = 10
[ ( 6 × a + 176 ) + 129 ] : 7 = 47
( 6 × a + 176 ) + 129 = 47 × 7 
( 6 × a + 176 ) + 129  = 329 
6 × a + 176 = 329 - 129 
6 × a + 176 = 200
6 × a = 200 - 176 
6 × a = 24
a = 24 : 6 
a = 4


7 × a = 75 - 45 + 200 : 5 
7 × a = 75 - 45 + 40
7 × a = 30 + 40 
7 × a = 70 
a = 70 : 7 
a = 10