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bonjour

A = [  -4 x 2 - ( 3 - 1 )] x ( - 10 )

A =  [ -  8 - ( 2 x- 10 ]

A = - 8 - ( - 20)

A = - 8 + 20 = 12

B = ( 49/15 x 10/21 )  : 2/9

B = ( 7/3 x 2 /3 ) : 2/9

B = 14/9  x 9/2

B = 126/18 = 7