Exercice 37:
A=((2x/5)-2)((5x/7)-1)
A=((2x/5)*(5x/7)-(2x/5)-2*(5x/7)+2
A=(2x^2/7)-(2x/5)-(10x/7)+2
A=(2x^2/7)-(14x/35)-(50x/35)+2
A=(2x^2/7)-(64x/35)+2
B=(x^2+3x+2)(4x^2-x-1)
B=x^2*4x^2-x^2*x-x^2+3x*4x^2-3x*x-3x+2*4x^2-2*x-2
B=4x^4-x^3-x^2+12x^3-3x^2-3x+8x^2-2x-2
B=4x^4+11x^3+4x^2-5x-2
C=7(x^2-2)(x+2)+x^2(2x-1)
C=7(x^3+2x^2-2x-4)+2x^3-x^2
C=7x^3+14x^2-14x-28+2x^3-x^2
C=5x^3+13x^2-14x-28
Exercice 39:
A=(3/2)(4x-6)-15((2/3)x+(1/5))
A=6x-9-10x-3
A=-4x-12
B=(x+2)/5+(2x-3)/10
B=(2x+4)/10+(2x-3)/10
B=(2x+4+2x-3)/10
B=(4x+1)/10
C=(2x/7)+(x+1)/2-(4x+3)/3
C=(12x/42)+(21x+21)/42-(56x+42)/42
C=(12x+21x+21-56x-42)/42
C=(-23x-21)/42
Exercice 58:
A=(x-3)(x+1)-(x-3)(x-1)
A=(x-3)(x+1-(x-1))
A=(x-3)(x+1-x+1)
A=2(x-3)
B=(x-2)^2-3(x-2)
B=(x-2)(x-2-3)
B=(x-2)(x-5)
C=(x-4)^2+3(x-4)(x+3)
C=(x-4)(x-4+3(x+3))
C=(x-4)(x-4+3x+9)
C=(x-4)(4x+5)