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ny.ken.5602
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Tính bằng cách thuận tiện nhất Câu 1: a) 1994 × 99 + 1994 b) 678 × 96 - 678 × 86 Câu 2: 4500 dm2 =.......m2. 12 m2 =..........dm2. 5 m2 =..........dm2 =..........cm2. 2 m2 =.........cm2. 10 dm2 39 cm2 =.........cm2 2300 m2=..........dm2
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