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How to calculate 18 △ 1.5-0.15 easily
18÷1.5-0.15
=18÷3×2-0.15
=6×2-0.15
=12-0.15
=11.85
How to calculate 15.6 + 18.2-15.6 + 18.2 simply?
15．6 + 18．2－15．6 + 18．2 =15.6-15.6+18.2+18.2=0+36.4=36.4
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