Ôn tập GK II toán 7

$$\frac{4}{7}=\frac{8}{14}$$

$$\frac{4}{14}=\frac{7}{8}$$

$$\frac{4}{8}=\frac{14}{7}$$

$$\frac{7}{8}=\frac{14}{4}$$

$$\frac{2}{15}=\frac{5}{6}$$

$$\frac{2}{6}=\frac{15}{5}$$

$$\frac{2}{6}=\frac{5}{15}$$

$$\frac{6}{2}=\frac{5}{15}$$

$$\frac{15}{5}=\frac{6}{2}$$

$$\frac{2}{6}=\frac{15}{5}$$

$$\frac{5}{2}=\frac{15}{6}$$

$$\frac{6}{2}=\frac{15}{5}$$

$$\frac{3}{5}=\frac{9}{15}$$

$$\frac{3}{15}=\frac{9}{5}$$

$$\frac{15}{5}=\frac{9}{3}$$

$$\frac{15}{9}=\frac{5}{3}$$

$$\frac{a}{2}=\frac{b}{3}=\frac{c}{4}$$

$$\frac{a}{3}=\frac{b}{4}=\frac{c}{2}$$

$$\frac{a}{4}=\frac{b}{2}=\frac{c}{3}$$

$$\frac{a}{4}=\frac{b}{3}=\frac{c}{2}$$

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$$3x^3-4x^5+2x^2+1$$

$$2x^2-4x^5+\ 3x^3\ +1$$

$$-4x^5+\ 3x^3\ +2x^2+1$$

$$1+2x^2+\ 3x^3\ -4x^5$$

$$4x^2\ +\ 3x^3\ -4x^5+1$$

$$-4x^2\ +\ 3x^3\ -4x^5+1$$

$$\ 3x^3\ -4x^5+1$$

$$-3x^3\ +4x^5-1$$

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