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31+31*3+31*6巧算?

31+31×3+31×6 =31×(1+3+6) =31×10 =310

31-39÷6 =31-36÷6-3÷6 =31-6-0.5 =25-0.5 =24.5

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

31×13-3×13 +3×3 =13×(31-3)+9 =13×28+9 =364+9 =373

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!

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~~~

31×25+75×23 =31×25+3×25×23 =31×25+25×69 =(31+69)×25 =100×25 =2500 对我的回答有不明白的可以追问! 祝学习进步!

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

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