bonjour pouvez vous m'aider a développer puis réduire ces calcules: A=3x(5-4x)-3-4x(7x-3) B=2x(5x-2x)+4x-2x(7x+1) C=6-2x5[7-2(3x+1)]+2(5-3x) D=x-x[3-(7-x)]-2x-[4x-(x-2)]

AIDER MOI SVP

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