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ngohuyen232
2 năm trước
Tại sao trong trường hợp này chỉ được sử dụng dấu "suy ra" mà không được sử dụng dấu tương đương? $\frac{(x+3)(x-2)}{(x-1)(x-2)}$$=$$\frac{x(x-1)}{(x-1)(x-2)}$ $\Rightarrow$$(x+3)(x-2)=x(x-1)$ Giải thích kĩ hộ mình với ạ. Cảm ơn!
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