bonjour pouvez vous maider le plus vite possible svp

1) reduire les expression suivantes:

a) 5a×2a
b) 7c×c
c) 5b×b²
d) -d×4d²
e) 4x²×y
f) h×(-h)


2) reduire chaque expression.

a)3x²+4x+5x²+2x
b)2x²-9x+5x²-2+x+7
c)2x X x + 3x²
d)x X 2 X3x X (-5)
e) -5x+x²+2x-x²+3x
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