(2又七分之一)-(-5又三分之一)-(+3又七分之一)-(-3又三分之二)怎么做?要求写出过程,

1个回答

  • (2又1/7)-(-5又1/3)-(+3又1/7)-(-3又2/3)

    =2又1/7+5又1/3+(-3又1/7)+3又2/3

    =[2又1/7+(-3又1/7)]+(5又1/3+3又2/3)

    =-(3又1/7-2又1/7)+9

    =-1+9

    =8

    -15又1/3-(3又1/7)-4又2/3-(-8又1/7)

    =-15又1/3+(-3又1/7)+(-4又2/3)+8又1/7

    =[(-15又1/3)+(-4又2/3)]+(8又1/7-3又1/7)

    =(-20)+5

    =-15

    -0.5-(3又1/4)+2.75-(7又1/2)

    =-0.5+(-3.25)+2.75+(-7.5)

    =2.75-(0.5+3.25+7.5)

    =2.75-11.25

    =-(11.25-2.75)

    =-8.5