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5/15加2/5加1/2等于多少简算写计算过程.

5/15+2/5+1/2 = 5/15+2/5-1/2+1 = 10/30+12/30-15/30+1 = 1又7/30

1/2×1/15+1/3×1/2 =1/2×(1/15+1/3) =1/2×6/15 =3/15 =1/5

3×(2/15+1/12)-2/5 =3×2/15+3×1/12-2/5 =2/5+1/4-2/5 =(2/5-2/5)+1/4 =0+1/4 =1/4

1/12 11/30 2/3 13/8 13/12 3/16 13/18 1/10

5/6减去括号,1/12加上2/15括回 化为数学式子即为5/6-(1/12+2/15) =50/60-(5/60+8/60) =50/60-13/60 =37/60

=45÷(2/5×15) =45÷6 =7.5 如果我的回答能够解决你的问题,希望你能够采纳我,如果有疑问继续追问,衷心感谢你的支持

13/15+1/2÷(4/5)+3/8 =13/15+5/8+3/8 =13/15+1 =1又13/15 你好,本题已解答,如果满意 请点右下角“采纳答案”。

1/5*1/2*(-15)+7*(-1/2) =(1/5*15+7)*(-1/2) =(3+7)*(-1/2) =10*(-1/2) =-5

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