(1/3m+0.75n)(0.8m-2/3n)

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(1/3m+0.75n)(0.8m-2/3n)(1/3m+0.75n)(0.8m-2/3n)(1/3m+0.75n)(0.8m-2/3n)=(1/3m+3/4n)(4/5m-2/3n)=4/15m平方

(1/3m+0.75n)(0.8m-2/3n)
(1/3m+0.75n)(0.8m-2/3n)

(1/3m+0.75n)(0.8m-2/3n)
=(1/3m+3/4n)(4/5m-2/3n)
=4/15m平方-2/9mn+3/5mn-1/2n平方

(1/3m十3/4n)(4/5m一2/3n)=4/15m^2一2/9mn十12/20mn一8/9n^2