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31+31*3+31*6巧算?

31+31×3+31×6 =31×(1+3+6) =31×10 =310

266-266+31+31就行了

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

1+7+13+19+25+31+37 =19x7 =133 等差数列取:中间数x个数=和 希望能帮到你!

8400÷124×31 =8400×31÷124 =2100×4×31÷(4×31) =2100

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

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

34+27+29+30+33+31 =30+4+30-3+30-1+30+30+3+30+1 =30*6+(4-3-1+3+1) =180+4 =184

1/2+1/3+1/30+1/31+1/41+20/51+10/119+26/120+38/123+27/124 =1/2+1/3+1/30+1/31+1/41+(1/3+1/17)+(1/7-1/17)+(1/4-1/30)+(1/3-1/41)+(1/4-1/31) =1/2+1/3+1/3+1/7+1/4+1/3+1/4 =2+1/7 =15/7 你看看吧!

如图

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