12题数学计算(写出步骤)可加分

1个回答

  • 84.[(-6又1/4)+(-2又1/2)^2]+(6又1/2)^2*(-4/13)

    =-25/4+25/4+(13^2/4)*(-4/13)

    =-13

    87.-2^4/(2又2/3)^2-5又1/2*(-1/6)+1.75

    =-16/(64/9)+11/12+7/4

    =-9/4+11/12+7/4

    =5/12

    90.(1又3/4-7/10+6又1/8)/(-7/8)

    =(7/4)/(-7/8)-(7/10)/(-7/8)+(49/8)/(-7/8)

    =(7/4)*(-8/7)-(7/10)*(-8/7)+(49/8)*(-8/7)

    =-2+4/5-7

    =-41/5

    92.89又29/30*(-9)+9又23/40*(-4)

    =(90-1/30) *(-9)+(10-17/40)*(-4)

    =810+3/10-40+17/10

    =770+2

    =772

    93.-1/7-[-2/7-2.25-(-4又1/7)-4又1/4]

    =-1/7-(-2/7-9/4+28/7-17/4)

    =-1/7-(26/7-26/4)

    =-1/7-26/7+26/4

    =27/14

    94.9又28/29*25-102/29*24

    =(10-1/29)*25-(102/29)*24

    =250-25/29-102*24/29

    =250-2473/29

    =174又20/29

    95.|-(-2)^2+(-2)^3 |- |(1/2)^3-(1/2)^2 |* |-2 |^2

    =(12-1/8)*4

    =48-1/2

    =95/2

    96.(1又1/2-7/8-7/12)/(1/2)^3*(-1又1/3)^2

    =〔(3/2)*8-(7/8)*8-(7/12)*8〕*(16/9)

    =(12-7-14/3)*(16/9)

    =16/27

    97.4*1又1/4-[(18-3又3/4*1.2/1/4*25-1.5/0.1]/(-1又1/2)

    =5-{[18-(15/4)*(6/5)*4〕*25-15}/(-3/2)

    =5-(12*25-15)*(-2/3)

    =5+300*(2/3)-15*(2/3)

    =195

    98.1又1/2/3/4*(-2)+1/2/[(-1/2)^3-(1又1/2)^2]*|-9又1/2|-0.75^2

    =-(3/2)*(4/3)*2-〔(1/2)/(-1/8-9/4)〕*(19/2)-9/16

    =-4+9-9/16

    =71/16

    99.4*125%-[(18-3又3/4*1.2/1/4)*25-1.5/0.1]/(-1又1/2)

    =6-{[18-(15/4)*(6/5)*4〕*25-15}/(-3/2)

    =6-(12*25-15)*(-2/3)

    =6+300*(2/3)-15*(2/3)

    =196

    100.-5.6+(-1又1/3)-(-5又3/5)-1又2/3

    =-5.6-4/3+5.6-5/3

    =-4/3-5/3

    =-3