(-1/42)除以(1/6-3/14+2/3-2/7)=多少?还有1又3分之一-7/12+9/20-11/30+13/4

1个回答

  • (-1/42)除以(1/6-3/14+2/3-2/7)

    =-1÷(42×1/6-42×3/14+42×2/3-42×2/7)

    =-1÷(7-9+28-12)

    =-1÷14

    =-1/14

    1又3分之一-7/12+9/20-11/30+13/42-15/56+17/72

    =1+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8+1/8+1/9

    =1+1/9

    =1又1/9

    (-1)的2012次方+(-3)的平方除以│-4又二分之一│-4的平方除以(-2的平方)

    =1+9÷4.5-16÷(-4)

    =1+2+4

    =7