化简(2a+b-c)²,(3a+2b)²,(3a-2a+1)²-(a-2b)(a+3b)

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化简(2a+b-c)²,(3a+2b)²,(3a-2a+1)²-(a-2b)(a+3b)化简(2a+b-c)²,(3a+2b)²,(3a-2a+1)&

化简(2a+b-c)²,(3a+2b)²,(3a-2a+1)²-(a-2b)(a+3b)
化简(2a+b-c)²,(3a+2b)²,(3a-2a+1)²-(a-2b)(a+3b)

化简(2a+b-c)²,(3a+2b)²,(3a-2a+1)²-(a-2b)(a+3b)
(2a+b-c)²
=4a^2+b^2+C^2+4ab-4ac-2bc
(3a+2b)²
=9a^2+12ab+4b^2
,(3a-2a+1)²-(a-2b)(a+3b)
=a^2+2a+1-(a^2+ab-6b^2)
=2a-ab+6b^2+1