Porque...
8 x 5 = 40 3 x 7 = 21 18 x 2 = 36
5 x 7 = 35 5 x 4 = 20 6 x 5 = 30
40 - 35 = 5 21 - 20 = 1 36 - 30 = 6
( 3 + 2 ) x 5 = 25 ( 2 + 7 ) x 3 = 27 ( 5 + 4 ) x 2 = x
( 5 ) x 5 = 25 ( 9 ) x 3 = 27 ( 9 ) x 2 = 18
( 3 + 2 + 5 ) x 3 = 30 ( 4 + 1 + 5 ) x 2 = 20 ( 7 + 2 + 6 ) x 3 = x
( 10 ) x 3 = 30 ( 10 ) x 2 = 20 ( 15 ) x 3 = 45
( 13 x 2 ) - ( 5 x 4 ) = 6 ( 8 x 7 ) - ( 8 x 6 ) = 8 ( 5 x 7 ) - ( 6 x 5 ) = x
( 26 ) - ( 20 ) = 6 ( 56 ) - ( 48 ) = 8 ( 35 ) - ( 30 ) = 5
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Verified answer
a) x = 6
Porque...
8 x 5 = 40 3 x 7 = 21 18 x 2 = 36
5 x 7 = 35 5 x 4 = 20 6 x 5 = 30
40 - 35 = 5 21 - 20 = 1 36 - 30 = 6
b) x = 18
Porque...
( 3 + 2 ) x 5 = 25 ( 2 + 7 ) x 3 = 27 ( 5 + 4 ) x 2 = x
( 5 ) x 5 = 25 ( 9 ) x 3 = 27 ( 9 ) x 2 = 18
c) x = 45
Porque...
( 3 + 2 + 5 ) x 3 = 30 ( 4 + 1 + 5 ) x 2 = 20 ( 7 + 2 + 6 ) x 3 = x
( 10 ) x 3 = 30 ( 10 ) x 2 = 20 ( 15 ) x 3 = 45
d) x = 5
Porque...
( 13 x 2 ) - ( 5 x 4 ) = 6 ( 8 x 7 ) - ( 8 x 6 ) = 8 ( 5 x 7 ) - ( 6 x 5 ) = x
( 26 ) - ( 20 ) = 6 ( 56 ) - ( 48 ) = 8 ( 35 ) - ( 30 ) = 5