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5.28+0.63+3.27的简便方法咋个算

5.28+0.63+3.27 =5.28+(0.63+3.27) =5.28+3.9 =9.18

我想到2种, 1是高斯定理, 2+28=30 4+26=30 前面一共是15个30=450 1+29=30 3+37=30 后面一共是14个30+15=435 减下来剩15 2是(2-1)+(4-3)+(6-5).....+(30-29)一共15项 1x15=15

30-29+…+4-3+2-1 =(30-29)×30÷2 =15

用简便方法计算 (1/27-1/36)÷1/9 =1/27÷1/9-1/36÷1/9 =1/3-1/4 =1/12 3/5×1/6+7/5÷6 =3/5×1/6+7/5×1/6 =(3/5+7/5)×1/6 =2×1/6 =1/3 7÷5×(5/7+5/28) =7/5×(5/7+5/28) =7/5×5/7+7/5×5/28 =1+1/4 =1又1/4 3/4×1/2÷3/4×2 =(3/4÷3/4)×(1/2...

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