Tolong bantu bang/kak.....NO NGASAL,POIN BESAR..

Tolong bantu bang/kak…..NO NGASAL,POIN BESAR..

Jawab:

2. x = 40 cm

3. CD=9 cm

Penjelasan dengan langkah-langkah:

2. $frac{x}{x+30}$ = $frac{10}{10+7.5}$ = $frac{4}{4+3}$

$frac{x}{x+30}$ = $frac{10}{17.5}$ (pilih salah satu)

$x(17.5) =10(x+30)$

$17.5x= 10x+300$

$17.5x - 10x = 300$

$7.5x= 300$

$x= frac{300}{7.5}$

= $40$

3. $frac{CD}{12}=frac{12}{16}$

16CD= 12×12

16CD=144

CD= $frac{144}{16}$

= 9cm

terima kasih