39 1/3*40 2/3 等于多少

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39 1/3*40 2/3 等于多少
39 1/3*40 2/3 等于多少

39 1/3*40 2/3 等于多少
=(40-2/3)(40+2/3)
=1600-4/9
=1599又5/9

39 1/3*40 2/3
=(40-2/3)*(40+2/3)
=40²-(2/3)²
=1600-4/9
=1599又9分之5