Bonjour,
a) (3 - 2/3) / (4/3 × 7)
= ( 9/3 - 2/3 ) / ( 28/3 )
= 7/3 ÷ 28/3
= 7/3 × 3/28
= 1/1 × 1/4
= 1/4
b) (2/3 ÷ 5/6) - 2/5
= (2/3 × 6/5) - 2/5
= 12/15 - 2/5
= 4/5 - 2/5
= 2/5
c) ( -3/4 + 1/2 ) / ( 2/5 - 5/2 )
= ( -3/4 + 2/4 ) / ( 4/10 - 25/10 )
= (-1/4) ÷ (-21/10)
= -1/4 × -10/21
= 10/84 = 5/42
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Bonjour,
a) (3 - 2/3) / (4/3 × 7)
= ( 9/3 - 2/3 ) / ( 28/3 )
= 7/3 ÷ 28/3
= 7/3 × 3/28
= 1/1 × 1/4
= 1/4
b) (2/3 ÷ 5/6) - 2/5
= (2/3 × 6/5) - 2/5
= 12/15 - 2/5
= 4/5 - 2/5
= 2/5
c) ( -3/4 + 1/2 ) / ( 2/5 - 5/2 )
= ( -3/4 + 2/4 ) / ( 4/10 - 25/10 )
= (-1/4) ÷ (-21/10)
= -1/4 × -10/21
= 10/84 = 5/42