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31+31*3+31*6巧算?

31+31×3+31×6 =31×(1+3+6) =31×10 =310

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

3.6×31.4+31.4×6.4+12.5×6.4 =31.4×(3.6+6.4)+12.5×0.8×8 =31.4×10+10×8 =314+80 =394

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

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!

0.3×6.9÷0.31×6.9 =(0.3÷0.31)×(6.9÷6.9) =31分之30×1 =31分之30 你好,本题已解答,如果满意 请点右下角“采纳答案”。

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

100-69-31 =100-(69+31) =100-100 =0

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