Wiskunde Multiple Choice Vraag uit Gricha's Wiskundige Vragenbank

$\frac{1-\frac ab}{1+ \frac ab}=$ _{(b ≠ 0)}	A. $-1$
	B. $0$
	C. $\frac{a+b}{b-a}$
	D. $\frac{b-a}{a+b}$
	E. $\frac{1-a}{ab}$

[ B-3740 - op net sinds 2.9.12-(E)-24.10.2023 ]

Translation in E N G L I S H

see above

Oplossing - Solution

$\large {\color{DarkGreen} \frac{1-\frac{a}{b}}{1+\frac{a}{b}}=\frac{\frac{b}{b}-\frac{a}{b}}{\frac{b}{b}+\frac{a}{b}}= \frac{\frac{b-a}{b}}{\frac{b+a}{b}}=\frac{b-a}{b}\cdot \frac{b}{b+a}=\frac{b-a}{b+a} }$