Bonsoir,
1.
simplifier chaque expression autant que. possible:
A=(-3)XyXyX4
= -12y²
B=tX(-5)XtXtX(-3)
= 15 t³
C=2XxX3Xx+5Xx-(4y+1)X(2y+9)
6x²+5x -(8y²+36y+2y+9)
=6x²+5x -8y²-36y-2y-9
= 6x² -8y² +5x -38y -9
2.
simplifier chaque expression autant que possible :
A=7x-(5x+3)
= 7x-5x -3= 2x -3
B=8-(3x-2)
= 8 -3x +2 = -3x+ 10
C=5+6x-(4x+2)
= 5+6x -4x -2
= 2x +3
D=-8+2x-(7x-1)
= -8 +2x -7x +1
= -5x -7
