Sagot :
Bonjour
1) 2,5x + 5,6 = 12
2,5x = 12 - 5,6
2,5x = 6,4
x = 6,4/2,5
x = 2,56
2) 7,8i - 8 = 1,3i + 2
7,8i - 1,3i = 2 + 8
6,5i = 10
i = 10/6,5
i = 1,538461538.
1) 2,5x + 5,6 = 12
2,5x = 12 - 5,6
2,5x = 6,4
x = 6,4/2,5
x = 2,56
2) 7,8i - 8 = 1,3i + 2
7,8i - 1,3i = 2 + 8
6,5i = 10
i = 10/6,5
i = 1,538461538.
1) 2,5x + 5,6 = 12
2,5x = 12 - 5,6
2,5x = 32/5
x = 64/25
2) 7,8i - 8 = 1,3i + 2
7,8i - 1,3i = 2 + 8
13/2x = 10
x = 20/13
2,5x = 12 - 5,6
2,5x = 32/5
x = 64/25
2) 7,8i - 8 = 1,3i + 2
7,8i - 1,3i = 2 + 8
13/2x = 10
x = 20/13