bonjour
A = ( - 4 + 3 x 2/7 ) : 3/14
A = ( - 4 + 6/7 ) : 3/14
A = ( - 28/7 + 6 /7 ) : 3/14
A = - 22/7 x 14/3
A = - 308/21 = - 44/3
B = ( 3/2)² - 1/3 x ( - 5 /2 )
B = 9/4 + 5/6
B = 27/12 + 10/12
B = 37/12
C = 6 - 4 ( 1/4 - 1 )
C = 6 - 4 ( 1/4 - 4/4)
C = 6 - 4 * - 3/4
C = 6 + 12/4
C = 6 + 3 = 9