速算巧算: 0.56÷7 1.02-0.2 5.1+9 10÷1% 1-1× 3 4 1÷7+ 1 2 1
速算巧算:0.56÷71.02-0.25.1+910÷1%1-1×341÷7+121÷0.25×40.99×9+0.9913×2÷13×2....
速算巧算: 0.56÷7 1.02-0.2 5.1+9 10÷1% 1-1× 3 4 1÷7+ 1 2 1÷0.25×4 0.99×9+0.99 1 3 ×2÷ 1 3 ×2.
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