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簡便運算:7.29平方-2.71平方, =(7.29+2.71)(7.20-2.71) =10×4.49 =44.9; 2.8×8+7.6×8-0.4×8=(2.8+7.6-0.4)*8 =10*8 =80 有什麼不明白可以繼續問,隨時線上等.
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