Tính: làm chi tiết giúp em `\frac{(5+2\sqrt{6})(49-20\sqrt{6})\sqrt{5-2\sqrt{6}}}{9\sqrt{3}-11\sqrt{2}}` 14/07/2021 Bởi Jade Tính: làm chi tiết giúp em `\frac{(5+2\sqrt{6})(49-20\sqrt{6})\sqrt{5-2\sqrt{6}}}{9\sqrt{3}-11\sqrt{2}}`
Làm gì thì làm cứ khử mẫu cái đã sau đó giải quyết từng vẫn đề 1 là xong. 😀 `((5+2sqrt6)(49-20sqrt6)sqrt{5-2sqrt6})/(9sqrt3-11sqrt2)` `=((5+2sqrt6)(49-20sqrt6)sqrt{5-2sqrt6}(9sqrt3+11sqrt2))/((9sqrt3)^2-(11sqrt2)^2)` `=((5+2sqrt6)(49-20sqrt6)sqrt{5-2sqrt6}(9sqrt3+11sqrt2))/(243-242)` `=(5+2sqrt6)(49-20sqrt6)sqrt{5-2sqrt6}(9sqrt3+11sqrt2)` `=(5+2sqrt6)(49-20sqrt6)(9sqrt3+11sqrt2)sqrt{3-2sqrt{3.2}+2}` `=(5+2sqrt6)(49-20sqrt6)(9sqrt3+11sqrt2)sqrt{(sqrt3-sqrt2)^2}` `=(3+2sqrt6+2)(49-20sqrt6)(9sqrt3+11sqrt2)|sqrt3-sqrt2|` `=(sqrt3+sqrt2)^2(49-20sqrt6)(9sqrt3+11sqrt2)(sqrt3-sqrt2)` `=(sqrt3+sqrt2)(sqrt3-sqrt2)(sqrt3+sqrt2)(49-20sqrt6)(9sqrt3+11sqrt2)` `=(3-2)(sqrt3+sqrt2)(49-20sqrt6)(9sqrt3+11sqrt2)` `=(sqrt3+sqrt2)(9sqrt3+11sqrt2)(49-20sqrt6)` `=(9.3+9sqrt6+11sqrt6+11.2)(49-20sqrt6)` `=(27+22+20sqrt6)(49-20sqrt6)` `=(49+20sqrt6)(49-20-sqrt6)` `=49^2-(20sqrt6)^2` `=2401-2400=1`.Đây số có đẹp không nào? :3 Bình luận
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Làm gì thì làm cứ khử mẫu cái đã sau đó giải quyết từng vẫn đề 1 là xong. 😀
`((5+2sqrt6)(49-20sqrt6)sqrt{5-2sqrt6})/(9sqrt3-11sqrt2)`
`=((5+2sqrt6)(49-20sqrt6)sqrt{5-2sqrt6}(9sqrt3+11sqrt2))/((9sqrt3)^2-(11sqrt2)^2)`
`=((5+2sqrt6)(49-20sqrt6)sqrt{5-2sqrt6}(9sqrt3+11sqrt2))/(243-242)`
`=(5+2sqrt6)(49-20sqrt6)sqrt{5-2sqrt6}(9sqrt3+11sqrt2)`
`=(5+2sqrt6)(49-20sqrt6)(9sqrt3+11sqrt2)sqrt{3-2sqrt{3.2}+2}`
`=(5+2sqrt6)(49-20sqrt6)(9sqrt3+11sqrt2)sqrt{(sqrt3-sqrt2)^2}`
`=(3+2sqrt6+2)(49-20sqrt6)(9sqrt3+11sqrt2)|sqrt3-sqrt2|`
`=(sqrt3+sqrt2)^2(49-20sqrt6)(9sqrt3+11sqrt2)(sqrt3-sqrt2)`
`=(sqrt3+sqrt2)(sqrt3-sqrt2)(sqrt3+sqrt2)(49-20sqrt6)(9sqrt3+11sqrt2)`
`=(3-2)(sqrt3+sqrt2)(49-20sqrt6)(9sqrt3+11sqrt2)`
`=(sqrt3+sqrt2)(9sqrt3+11sqrt2)(49-20sqrt6)`
`=(9.3+9sqrt6+11sqrt6+11.2)(49-20sqrt6)`
`=(27+22+20sqrt6)(49-20sqrt6)`
`=(49+20sqrt6)(49-20-sqrt6)`
`=49^2-(20sqrt6)^2`
`=2401-2400=1`.Đây số có đẹp không nào? :3