①2x+(x-4)-(5x-4)②3(a^2-2a-3)-5(-5a^2-2)
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①2x+(x-4)-(5x-4)②3(a^2-2a-3)-5(-5a^2-2)①2x+(x-4)-(5x-4)②3(a^2-2a-3)-5(-5a^2-2)①2x+(x-4)-(5x-4)②3(a^2
①2x+(x-4)-(5x-4)②3(a^2-2a-3)-5(-5a^2-2)
①2x+(x-4)-(5x-4)②3(a^2-2a-3)-5(-5a^2-2)
①2x+(x-4)-(5x-4)②3(a^2-2a-3)-5(-5a^2-2)
①=2x+x-4-5x+4=-2x
②:3a²-6a-9+25a²+10=28a²-6a+1
①2x+(x-4)-(5x-4)=2x+x-4-5x+4=-2x
②3(a^2-2a-3)-5(-5a^2-2)=3a²-6a-9+25a²+10=28a²-6a+1
①2x+(x-4)-(5x-4)
=2x+x-4-5x+4
=-2x
②3(a^2-2a-3)-5(-5a^2-2)
=3a^2-6a-9+25a^2+10
=28a^2-6a+1
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