Question

$Daca \frac{2,25}{a} = \frac{b}{0,2}, calculati 100ab$

Answer 1

2,25/a=b/0,2
a×b=2,25 × 0,2
ab=0,45
100ab=0,45 × 100
100ab=45

Answer 2

$\displaystyle \frac{2,25}{a} = \frac{b}{0,2} \Rightarrow 2,25 \cdot 0,2=ab \Rightarrow 0,45=ab \Rightarrow ab=0,45 \\ \\ 100ab=100 \cdot 0,45=45 \\ \boxed{100ab=45}$