30 Développer et réduire les expressions.
A = 3(x + 8) + 4(7x + 2)
B = 5(x-1)-7x(2 + 3x)
C = 2x(4-5x) - (x-7)
D = (3-8x) - 5(4x-7)
E = 7(3-2x) - 4x(2x - 1)
F = 7x-5(2-9x)+7(9x - 1)
A = 3(x + 8) + 4(7x + 2)
B = 5(x-1)-7x(2 + 3x)
C = 2x(4-5x) - (x-7)
D = (3-8x) - 5(4x-7)
E = 7(3-2x) - 4x(2x - 1)
F = 7x-5(2-9x)+7(9x - 1)
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Bonjour;
A = 3(x + 8) + 4(7x + 2)
= 3x+24 +28x +8
= 31x +32
B = 5(x-1)-7x(2 + 3x)
= 5x -5 -14x -21x²
= -21x² -9x -5
C = 2x(4-5x) - (x-7)
= 8x -10x² -x +7
= -10x² +7x +7
D = (3-8x) - 5(4x-7)
= 3-8x -20x +35
= -28x +38
E = 7(3-2x) - 4x(2x - 1)
= 21 -14x -8x² +4x
= -8x² -10x +21
F = 7x-5(2-9x)+7(9x - 1)
=7x -10+45x +63x -7
= 115x-17