Chọn đáp án sai: $$\frac{a}{b}+0=\frac{a}{b}$$ , $$\frac{a}{b}+\frac{c}{d}=\frac{c}{d}+\frac{a}{b}$$ , $$\frac{a}{b}+\left(\frac{c}{d}+\frac{e}{f}\right)=\left(\frac{a}{b}+\frac{e}{f}\right)-\frac{c}{d}$$ , $$\frac{a}{b}+\left(\frac{c}{d}-\frac{e}{f}\right)=\left(\frac{a}{b}+\frac{c}{d}\right)-\frac{e}{f}$$

$$\frac{a}{b}+\left(\frac{c}{d}+\frac{e}{f}\right)=\left(\frac{a}{b}+\frac{e}{f}\right)-\frac{c}{d}$$ is incorrect.

Chọn câu sai: $$\frac{3}{2}+\frac{2}{3}>1$$ , $$\frac{3}{2}+\frac{2}{3}=\frac{13}{6}$$ , $$\frac{3}{4}+\left(\frac{-4}{17}\right)=\frac{35}{68}$$ , $$\frac{4}{12}+\frac{21}{36}=1$$

$$\frac{4}{12}+\frac{21}{36}=1$$

Phép cộng và phép trừ phân số lớp 6 Flashcards

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Chọn câu đúng. Với a, b, m ∈ Z; m ≠ 0 ta có:

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