Sagot :
bonsoir
( 3 b - 5 ) / ( 9 + 7 b) = 2 /3
9 b - 15 = 14 b + 18
9 b - 14 b = 18 + 15
- 5 b = 33
b = - 33 /5 = - 6.6
( 3 * - 6.6 - 5 ) / ( 9 + 7 * - 6.6 ) = 2/3
( - 19.8 - 5 ) / ( 9 - 46.2 ) = 2 /3
- 24.8 : - 37.2 = 2 /3
0.6666...... = 0.666.....
Bonsoir,
- 3b-5/9+7b = 2/3
- 3b-5/9+7b = 2/3 ; b ≠ -9/7
- 3(3b-5) = 2(9+7b)
- 9b-15 = 2(9+7b)
- 9b-15 = 18+14b
- 9b-15-14b = 18
- 9b-14b = 18+15
- -5b = 18+15
- -5b = 33
- b = -33/5 ; b ≠ -9/7
- b = -33/5
/ = fraction.
Bonne soirée.