4m 31cm + 6m 87cm = - 11m 18cm, 3 x 5m 29cm = - 15m 87cm, 37m - 24m 34cm = - 12m 66cm, 16m 56cm ÷ 8 = - 2m 7cm, 38m 55cm ÷ 3 = - 12m 85cm,

三年级长度(加减乘除)

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