赚现金
我会利用商不变的性质简算. (1)560÷3.5 (2) 3.9÷26 (3)2.87÷0.25=560÷(0.5×7) =3.9÷ ÷ = ÷(0.25×4)=560÷7÷0.5 = = = = =
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