a. $\frac{2-x}{4}$= $\frac{x+1}{-3}$ b. $\frac{2-5x}{3}$= $\frac{-4x+1}{-5}$ c. $\frac{1}{3}$ (2x-1)-4(5-2x)=3(x+1)

Cho tam giác DEF vuông tại D có EM là tia phân giác. so sánh DM và MF

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