Bonjour,
I) 3x + 7/5 = 4
3x = 4 - 7/5
15/5x = 20/5 - 7/5
15x = 20 - 7
15x = 13
x = 13/15
2) 1 + 2 : 5/5 - 3 : 4
= 1 + 2 x 1 - 3 x 1/4
= 1 + 2 - 3/4
= 3 - 3/4
= (3 x 4) / (1 x 4) - 3/4
= 12/4 - 3/4
= 9/4
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Bonjour,
I) 3x + 7/5 = 4
3x = 4 - 7/5
15/5x = 20/5 - 7/5
15x = 20 - 7
15x = 13
x = 13/15
2) 1 + 2 : 5/5 - 3 : 4
= 1 + 2 x 1 - 3 x 1/4
= 1 + 2 - 3/4
= 3 - 3/4
= (3 x 4) / (1 x 4) - 3/4
= 12/4 - 3/4
= 9/4