(x-2y)(x+2y)(x的2次方-4y的2次方)=

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(x-2y)(x+2y)(x的2次方-4y的2次方)=(x-2y)(x+2y)(x的2次方-4y的2次方)=(x-2y)(x+2y)(x的2次方-4y的2次方)=x^4-16y^4(20/40)*20

(x-2y)(x+2y)(x的2次方-4y的2次方)=
(x-2y)(x+2y)(x的2次方-4y的2次方)=

(x-2y)(x+2y)(x的2次方-4y的2次方)=
x^4-16y^4

(20/40)*20 = (m/17)*10 =2:1
m=8.5g

x^4-16y^4