初中有理数的加减混合运算(1)-5-9+3(2)10-17+8(3)-3-4+19-11(4)-8+12-16-23(5

1个回答

  • (1)-5-9+3=-14+3=-11

    (2)10-17+8=-7+8=1

    (3)-3-4+19-11=-7+19-11=1

    (4)-8+12-16-23=4-16-23=-12-23=-35

    (5)-4.2+5.7-8.4+10=1.5-8.4+10=-6.9+10=3.1

    (6)6.1-3.7-4.9+1.8=2.4-4.9+1.8=-2.5+1.8=-0.7

    (7)1/3-2/3+1=-1/3+1=2/3

    (8)-1/4+5/6+2/3-1/2=7/12+8/12-6/12=15/12-6/12=3/4

    (9)(-36)-(-25)-(+36)+(+72)=-36+25-36+72=25

    (10)(-8)-(-3)+(+5)-(+9)=-8+3+5-9=-9

    (11)-1/2+(-1/6)-(-1/4)-(+2/3)=-6/12-2/12+3/12-8/12=-13/12

    (12)-9+(-3|3/4)-3|3/4=-9-3|3/4-3|3/4=-12|3/4-3|3/4=-16|1/2

    (13)12-(-18)+(-7)-15=12+18-7-15=8

    (14)-40-28-(-19)+(-24)-(-32)=-40-28+19-24+32=-41