bonjour
A = 2/7 - 3/7 x 14/9
= 2/7 - 42/63
= 18/63 - 42 /63
= 24/63 = 8/21
B = - 7/8 x ( 2/3 - 3 /3 )
= - 7/8 x - 1/3
= 7/24
C = 4/5 x 1/4 + 2/5
= 4/20 + 8/20
= 12/20 = 3 /5
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bonjour
A = 2/7 - 3/7 x 14/9
= 2/7 - 42/63
= 18/63 - 42 /63
= 24/63 = 8/21
B = - 7/8 x ( 2/3 - 3 /3 )
= - 7/8 x - 1/3
= 7/24
C = 4/5 x 1/4 + 2/5
= 4/20 + 8/20
= 12/20 = 3 /5