вычислить: 1) 7сут.6ч.-5сут.8ч.=? 2) 35 м.кв.70см.кв.-90дм.кв.=? 3) 4ц. 86кг.*13=? 4)15км.кв.-20га=? 5) 14км. 490м./18=? 6) 2ч. 5мин.-55 мин.=?
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