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1). 5,2÷2,1= 52/10 ÷21/10=52/10 × 10/21= 52/21= 2,47
2). 7,1÷1,2= 71/10÷12/10=71/10 × 10/12= 71/12=5,9
3). 8,1÷1,2= 81/10÷12/10= 81/10× 10/12=81/12=27/4=6,75
4). 2×2,1= 2×21/10=42/10=4,2
5).1×1,2= 1,2
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