Bonsoir,
1→ 5x - 7 + 9x +4 = 14x -3 → E
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2→ -6x - 3 + 3x - 5 = -3x -8 → x
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3→ 5x² - 3x + 7 + 7x + 4x² + 2 = 9x² + 4x + 9
→ E
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.
4→ 2(3x+5)+3(2x-7) = 6x+10+6x-21 = 12x -11 → R
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.
5→ -3(4x-1)-2(3x-4) = -12x+3-6x +8 = -18x +11
→ C
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6→ 2 (7x-3) - 4 = 14x - 6 - 4 = 14x - 10 → I
.
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7→ 2x(5x+4)-(8x²+2) = 10x²+8x- 8x²-2
= 2x²+8x-2→C
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8→ 3(7x-5)-(2x+3)*3 = 21x-15-6x-9 = 15x - 24
→ E
.
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9→ 4x²-2-(9x²-7x+4) = 4x²-2-9x²+7x-4
= -5x²+7x -6→R
.
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10→ (5x-3)(2x+7) = 10x²+35x-6x-21
= 10x²+29x-21→E
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.
11→ 4x-2(-3x-5) = 4x + 6x + 10 = 10x +10 → S
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12→ (3x-2)(-6x+4)+8x² = -18x²+12x+12x-8+8x²
= -10x² + 24x -8 → O
.
.
13→ (4-5x)(2x-8)-2x+24
= 8x - 32 - 10x² + 40x - 2x + 24
= -10x² + 46x - 8 → R
.
.
14→ 2x²+(3-2x)(2+5x)+4
= 2x² + 6 + 15x -4x -10x² +4
= -8x² + 11x + 10 → U
.
.
.
Le mot mystère :
EXERCICE RÉSOLU.
.
.
Et en effet, c'est le cas(◠‿◕)✅
.
'
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Bonne soirée.
