(x-7)(x-9)

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(x-7)(x-9)

(x-7)(x-9)
(x-7)(x-9)

(x-7)(x-9)
(x-7)(x-9)

(x-7)(x-9)<3(x-7)
x^2-16x+63<3x-21
x^2-19x+84<0
(x-12)(x-7)<0
则 7<x<12

(x-7)(x-9)<3(x-7)
x-9<3 ............................两边同时除以(x-7),要是先拆开的话就太麻烦了
x<12 .............................这一步你应该知道吧,...

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(x-7)(x-9)<3(x-7)
x-9<3 ............................两边同时除以(x-7),要是先拆开的话就太麻烦了
x<12 .............................这一步你应该知道吧,两边都加上9
(答题不易,望采纳,谢谢)

收起

(x-7)(x-9)-3(x-7)<0
∴(x-7)(x-9-3)<0
(x-7)(x-12)<0
∴7<x<12

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