第48页

信息发布者:
$8×15=120$
$24×5=120$
$120=120,$能组成比例
$8:24=5:15$
$0.9×1.8=1.62$
$0.45×3.2=1.44$
$1.62≠1.44,$不能组成比例
$\dfrac{1}{3}×6=2$
$\dfrac{1}{5}×10=2$
$2=2,$能组成比例
$\dfrac{1}{3}:\dfrac{1}{5}=10:6$
$\dfrac{2}{9}×\dfrac{12}{5}=\dfrac{8}{15}$
$\dfrac{6}{5}×\dfrac{4}{9}=\dfrac{8}{15}$
$\dfrac{8}{15}=\dfrac{8}{15},$能组成比例
$\dfrac{2}{9}:\dfrac{6}{5}=\dfrac{4}{9}:\dfrac{12}{5}$
$18×40=16×45$
$18:16=45:40$
3
3
8
12
$\dfrac{21}{20}$