SVP aider moi il faut réduire ces expressions
A. -3x²+8x²-2x²-(5+2x)
B. 9x²+3x²-7+x+x²
C. (3x)²-(2 *4x+5)
D. 6x²-(3x+8)+7
E.(2x)²+10x-3x+x-5


* = c'est la multiplication
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