计算:(a+2/a²-2a-a-1/a²-4a+4)÷a-4/a
展开全部
(a+2/a²-2a-a-1/a²-4a+4)÷a-4/a
=[(a+2)/a(a-2) -(a-1)/(a-2)² ]× a/(a-4)
=(a-4)/a(a-2)² ×a/(a-4)
=1/(a-2)²
解下列方程:
x/x-2-1/x²-4=1
x(x+2)-1=x²-4
x²+2x-1=x²-4
x=-3/2
2x+1/x-1+6/x²-1=2
(2x+1)(x+1)+6=2(x²-1)
2x²+3x+7=2x²-2
3x=-9
x=-3
=[(a+2)/a(a-2) -(a-1)/(a-2)² ]× a/(a-4)
=(a-4)/a(a-2)² ×a/(a-4)
=1/(a-2)²
解下列方程:
x/x-2-1/x²-4=1
x(x+2)-1=x²-4
x²+2x-1=x²-4
x=-3/2
2x+1/x-1+6/x²-1=2
(2x+1)(x+1)+6=2(x²-1)
2x²+3x+7=2x²-2
3x=-9
x=-3
追问
分解因式(a²+4)²-16a²
追答
(a²+4)²-16a²
=(a²+4)²-(4a)²
=(a²+4+4a)(a²+4-4a)
=(a+2)²(a-2)²
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