(3m-2n) (4n-5m)怎么算?

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(3m-2n)(4n-5m)怎么算?(3m-2n)(4n-5m)怎么算?(3m-2n)(4n-5m)怎么算?(a^2+a+1)(a^2-a+1),=[(a^2+1)+a][(a^2+1)-a]=(a^

(3m-2n) (4n-5m)怎么算?
(3m-2n) (4n-5m)怎么算?

(3m-2n) (4n-5m)怎么算?
(a^2+a+1) (a^2-a+1),=[(a^2+1)+a] [(a^2+1)-a] = (a^2+1)^2-a ^2 = a^4+2a^2+1-a ^2= a^4+a^2+1
(2X-3Y) (2X+3Y) (4X^2+9Y^2)=(4X^2-9Y^2)(4X^2+9Y^2)=16X^4-81Y^4

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(3m-2n) (4n-5m)
=12mn-15m²-8n²+10mn
=-15m²+22mn-8n²再问你几个问题 (a^2+a+1) (a^2-a+1), (2X-3Y) (2X+3Y) (4X^2+9Y^2)回答正确给你20财富值!!(a^2+a+1) (a^2-a+1), =(a...

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展开:
(3m-2n) (4n-5m)
=12mn-15m²-8n²+10mn
=-15m²+22mn-8n²

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