関連ワード:  what is a variable in a math problem    what is a variable in a math equation    what is a variable in a math question    what is the independent variable in a math problem    what is a variable in math word problems    what is the dependent variable in a math problem    what is a dependent variable in a math equation    what is a variable in math examples    what is the independent variable in a math equation    what is a dependent variable in math examples