nhanh lên nhé chậm nhất 5 phút Đề :a)x+8/x^2-16-2/x^2+4x b) x+3 /x^2-1-1/x^2+x

tranthinga111975

2 năm trước

Loga Sinh Học lớp 12

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wiieee123

`***`Lời giải`***`

ĐKXĐ: `xne0;xne±4`

`(x+8)/(x^2-16)-2/(x^2+4x )`

`=(x+8)/((x-4)(x+4))-2/(x(x+4) )`

`=(x(x+8))/(x(x-4)(x+4))-(2(x-4))/(x(x+4)(x-4) )`

`=(x(x+8)-2(x-4))/(x(x-4)(x+4))`

`=(x^2+8x-2x+8)/(x(x-4)(x+4))`

`=(x^2+6x+8)/(x(x-4)(x+4))`

`=(x^2+2x+4x+8)/(x(x-4)(x+4))`

`=(x(x+2)+4(x+2))/(x(x-4)(x+4))`

`=((x+4)(x+2))/(x(x-4)(x+4))`

`=(x+2)/(x(x-4))`

ĐKXĐ: `xne0;xne±1`

`(x+3 )/(x^2-1)-1/(x^2+x)`

`=(x+3 )/((x-1)(x+1))-1/(x(x+1))`

`=(x(x+3)-(x-1) )/(x(x-1)(x+1))`

`=(x^2+3x-x+1)/(x(x-1)(x+1))`

`=(x^2+2x+1)/(x(x-1)(x+1))`

`=((x+1)^2)/(x(x-1)(x+1))`

`=(x+1)/(x(x-1))`

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buithithuhuyen718

Đáp án+Giải thích các bước giải:

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:((( làm nhanh hộ pạn Zuy Lớp 7 làm đựt:U

Sự bền bỉ có thể biến thất bại thành,thành tựa của thành công (Mavu Levy) Hãy viết một đoạn Văn 200 Chữ Về Ý Kiến Trên Đầy Đủ Chi Tiết Rõ Ràng (Cấm Chép Mang Nếu Ko Báo Cáo)

mình đang cần gấp, mọi người làm nhanh giúp mình

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……………… Bài này lớp 7 làm đưtk :(

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