bonsoir
A = 25 /21 x 14/5
A = 5/3 x 2 = 10/3
B = - 21/6 x - 9/56
B = - 3/2 x - 3 /8 = 9/16
C = -49/63 x 9 /-28
= - 7/ 7 x - 1 /4
= - 1 x - 1/4
= 1/4
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bonsoir
A = 25 /21 x 14/5
A = 5/3 x 2 = 10/3
B = - 21/6 x - 9/56
B = - 3/2 x - 3 /8 = 9/16
C = -49/63 x 9 /-28
= - 7/ 7 x - 1 /4
= - 1 x - 1/4
= 1/4