数学有理数的四则混合运算题目如下,速度,要过程,Thanks...

1个回答

  • 1)-20÷5×1/4+5×(-3)/15

    =-4×1/4-1

    =-1-1

    =-2

    2)[1/24÷(-1又1/4)×(-5/6)÷(-3又1/6)]-0.25÷1/4

    =1/24×4/5×5/6×(-6/19)-1

    =-1/114-1

    =-115/114

    3)-3×[-5+(1-0.2÷3/5)÷(-2)]

    =-3×[-5+2/3÷(-2)]

    =-3×[-5-1/3]

    =15+1

    =16

    4)对1,2,3,4可作运算(1+2+3)×4=24,现有有理数3,4,-6,10,请运用加,减,乘,除法则写出三种不同的计算算式,使其结果为24.

    (1)3×[(10+4)+(-6)]=24

    (2)3×(10-4)-(-6)=24

    (3)10-4-3×(-6)=24