计算题(每小题4分,共32分)⑴ —54×2 ÷(—4 )×

1个回答

  • (1)6;(2)-19;(3)-5;(4)-2;

    (5)24;(6)90 (7) 0 (8)

    (1)-54×2

    ÷(-4

    )×

    =54×

    ×

    ×

    =6;

    (2)(

    -

    +

    )×(-36)

    =-18+20-21

    =-19;

    (3)-4×7-(-3)×6+5

    =-28+18+5

    =-5;

    (4)-1-[1-(1-0.5×

    )]×6

    =-1-[1-(1-

    ×

    )]×6

    =-1-6+6-

    ×

    ×6

    =-1-6+6-1

    =-2;

    (5)-2 2-(-3) 3×(-1) 4-(-1) 5

    =-4+27×1+1

    =-4+27+1

    =24;

    (6)(-

    )×(-4) 2-0.25×(-5)×(-4) 3

    =-

    ×16-0.25×5×64

    =-10-80

    =-90;

    (7)(-1)+(-1) 2+(-1) 3+…+(-1) 99+(-1) 100

    =-1+1-1+…-1+1

    =0;

    (8)

    +

    +

    =

    )+

    ×(

    -

    )+

    ×(

    -

    )+…+

    ×(

    -

    =

    ×(

    -

    =