초4 수학다지기 D01 3주 15











>> YOUR LINK HERE: ___ http://youtube.com/watch?v=LO37uorKxjc

#4학년수학 #초4수학 #초등수학 #초4 #수학 #수학다지기 #수연산 #덧셈#뺄셈#곱셈 #나눗셈#교환법칙#결합법칙#분배법칙

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