bonsoir également !
A =5−(−2x +3) + 4x(2 −5x) −1
= 5 + 2 x - 3 + 8 x - 20 x² - 1
= - 20 x² + 10 x + 1
B = −3x(5− x) + 2(5− 4x) +3x −(5− x)
- 15 x + 3 x² + 10 - 8 x + 3 x - 5 + x
= 3 x² - 19 x + 5
C =4x + 2(5x − 4) − (−x −3) +8x(2 + x)
= 4 x + 10 x - 8 + x + 3 + 16 x + 8 x²
= 8 x² + 31 x - 5
D =7 −(−2x +1) + 6x(3− x) −(−4 +5x) − 2
= 7 + 2 x - 1 + 18 x - 6 x² + 4 - 5 x - 2
= - 6 x² + 15 x + 8
E =3x(4 − 2x) −(−x² +5) +5(4 + 2x) −(−x + 2)
= 12 x - 6 x² + x² - 5 + 20 + 10 x + x - 2
= - 5 x² + 22 x + 13
idem pour le 2
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bonsoir également !
A =5−(−2x +3) + 4x(2 −5x) −1
= 5 + 2 x - 3 + 8 x - 20 x² - 1
= - 20 x² + 10 x + 1
B = −3x(5− x) + 2(5− 4x) +3x −(5− x)
- 15 x + 3 x² + 10 - 8 x + 3 x - 5 + x
= 3 x² - 19 x + 5
C =4x + 2(5x − 4) − (−x −3) +8x(2 + x)
= 4 x + 10 x - 8 + x + 3 + 16 x + 8 x²
= 8 x² + 31 x - 5
D =7 −(−2x +1) + 6x(3− x) −(−4 +5x) − 2
= 7 + 2 x - 1 + 18 x - 6 x² + 4 - 5 x - 2
= - 6 x² + 15 x + 8
E =3x(4 − 2x) −(−x² +5) +5(4 + 2x) −(−x + 2)
= 12 x - 6 x² + x² - 5 + 20 + 10 x + x - 2
= - 5 x² + 22 x + 13
idem pour le 2