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31+31*3+31*6巧算?

31+31×3+31×6 =31×(1+3+6) =31×10 =310

你确定题目里第四个数字是31而不是32?

解:原式=31.4×(3.6+6.4)+12.5×8×0.8=314+80=394

3.14×0.68+31.4×0.032 =3.14×0.68+3.14×0.32 =3.14(0.68+0.32) =3.14

31.4*6.25-0.314+3.14*37.6 =3.14*62.5-0.1*3.14+3.14*37.6 =3.14*(62.5+37.6-0.1) =3.14*100 =314

8400÷124×31 =8400÷(4x31)x31 =8400x1/4x1/31x31 =8400x1/4x(1/31x31) =2100x1 =2100 祝学习进步,望采纳~~~

用加法交换律,把13和37归到一组,把19和31归到一组,剩下的1、7、25单列。即原式=(13+37)+(19+31)+1+7+25=50+50+8+25=100+8+25=133

好像不行

31.4X10.1 =31.4X10+31.4X0.1 =314+3.14 =317.14

31-18=(30+1)-(20-2)=30-20+1+2=13

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