(a^4-16b^4)÷(a^2+4b^2)÷(2b-a)=没想到一小女孩用初中题目把我难道了
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(a^4-16b^4)÷(a^2+4b^2)÷(2b-a)=没想到一小女孩用初中题目把我难道了
(a^4-16b^4)÷(a^2+4b^2)÷(2b-a)=
没想到一小女孩用初中题目把我难道了
(a^4-16b^4)÷(a^2+4b^2)÷(2b-a)=没想到一小女孩用初中题目把我难道了
a^4-16b^4=(a^2+4b^2)(a^2-4b^2)
a^2-4b^2=(a+2b)(a-2b)
(a^4-16b^4)÷(a^2+4b^2)÷(2b-a)
=(a^2-4b^2)÷(2b-a)
=-a-2b
原式=(a²+4b²)(a²-4b²)÷(a²+4b²)÷(2b-a)
=(a²-4b²)÷(2b-a)
=-(a+2b)=-a-2b
(a^4-16b^4)÷(a^2+4b^2)÷(2b-a)
=÷(a^2+4b^2)÷(2b-a)
=(a^2+4b^2)(a^2-4b^2)÷(a^2+4b^2)÷(2b-a)
=(a^2-4b^2)÷(2b-a)
=(a+2b)(a-2b)÷(2b-a)
=-(a+2b)
a^4-16b^4=a^4-(2b)^4
a^4-(2b)^4/(a^2+(2b)^2)=(a^2+(2b)^2)(a^2-(2b)^2)/(a^2+(2b)^2)=a^2-(2b)^2
a^2-(2b)^2/2b-a=2b-a
-a-2b