Question

se da a/b=3/5;calculați 4a/3a+3b...este urgent va rogggg.​

Answer 1

4a/(3a + 3b) =

= (4a/b) / (3a/b + 3b/b) =

= (4a/b) / (3a/b + 3) =

= (4×3/5) / (3×3/5 + 3) =

= (12/5) / (9/5 + 15/5) =

= (12/5) / (24/5) =

= 12/5 × 5/24 =

= 1/2

Answer 2

$\it \frac{a}{b} = \frac{3}{5} <=> 5a = 3b <=> a = \frac{3b}{5} \\ \\ \frac{4a}{3a+3b} = \frac{4 \cdot \frac{3b}{5} }{3 \cdot \frac{3b}{5} + 3b } = \frac{\frac{12b}{5} }{\frac{9b}{5} ~+~^{5)} 3b} = \frac{\frac{12b}{5} }{\frac{9b}{5} + \frac{15b}{5} } = \frac{\frac{12b}{5} }{\frac{24b}{5} } = \frac{12 \not b}{\not 5} \cdot \frac{\not 5}{24 \not b} = \frac{12}{24}^{(12} = \frac{1}{2}$