Ответ: ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++#1 7x²+21x=07x*(x+3)=0x*(x+3)=0x=0 x₁=0x+3=0 x₂=-3==========================================================#23m(2m-1)-(m+3)(m-2)==6m²-3m-(m²-2m+3m-6)==6m²-3m-(m²+m-6)==6m²-3m-m²-m+6==5m²-4m+6++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Ответ: 7x²+21x=07x(х+3)=07х=0 х+3=0х₁=0 х₂=-3———————————————3m(2m-1)-(m+3)(m-2)=6m²-3m-(m²+3m-2m-6)= 6m²-3m-m²-m+6=5m²-4m+6
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