4〔X-〕²-9〔X+1〕²=0 怎么算啊
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4〔X-〕²-9〔X+1〕²=0 怎么算啊
4〔X-〕²-9〔X+1〕²=0 怎么算啊
4〔X-〕²-9〔X+1〕²=0 怎么算啊
9(X-2)2 -16(X +1)2 = 0
[3(X-2)] 2 - [4(X +1)] 2 = 0
(3X-6 2)2 - (4×4)2 = 0
[(3×1-6)+(4×4)] [(3×1-6) - (4×4)] = 0
(7X- 2)(-X-10)= 0
然后:7倍-2 = 0或-x-10 = 0
得到:X = 2/7或x = -10