• LEVEL 1 Setting Up Ratios (建立比例)
  • LEVEL 2 Equivalent Ratios (等值比例)
  • LEVEL 3 Scaling Ratios (缩放比例)
  • LEVEL 4 Unit Rates (单位速率/单位率)
  • LEVEL 5 Proportional Relationships (比例关系)
  • LEVEL 6 Graphing Proportional Relationships (用图表表示比例关系)
  • LEVEL 7 Equations for Proportional Relationships (比例关系方程)
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