Bài 1 : Tính 1) (-12).13+13.(-22) 2)(-79).(-88)+(-21).(-88) 3)11.107+11.18-25.11 4) 5.4-15.5+7 5) 60.(45-

0 bình luận về “Bài 1 : Tính 1) (-12).13+13.(-22) 2)(-79).(-88)+(-21).(-88) 3)11.107+11.18-25.11 4) 5.4-15.5+7 5) 60.(45-”

1. @isa

   Bài 1 : Tính

   `1) (-12).13+13.(-22)`

   `= (- 156) + (- 286)`

   `= (- 442)`

   `2)(-79).(-88)+(-21).(-88)`

   `= 6952 + 1848`

   `= 8800`

   `3)11.107+11.18-25.11`

   `= 1177 + 198 – 275`

   `= 1375 – 275`

   `= 1100`

   `4) 5.4-15.5+7`

   `= 20 – 75 + 7`

   `= – 55 + 7`

   `= – 48`

   `5) 60.(45-15)-45.(60-15)`

   `= 1800 – 2025`

   `= – 225`

   `6)85.(17-35)-18.(40-55)`

   `= – 1530 + 270`

   `= – 1260`

   `7) 2155-(174+2155)+(-68+174)`

   `= – 174 + 106`

   `= – 68`

   `8)-25.72+25.21-49.25`

   `= – 1800 +525 – 1225`

   `= – 1275 – 1225`

   `= – 2500`

   `9)8154-(674+8154)+(-98+674)`

   `= – 674 + 576`

   `= – 98`

   `10) 44.(-36)+22.(-28)`

   `= – 1584 – 616 `

   `= – 2200`

        Chúc bn hc tốt !!

    

   Trả lời

2. Đáp án:

   1) (-12).13+13.(-22)

   = (- 156) + (- 286)

   = (- 442)

   2)(-79).(-88)+(-21).(-88)

   = 6952 + 1848

   = 8800

   3)11.107+11.18-25.11

   = 1177 + 198 – 275

   = 1375 – 275

   = 1100

   4) 5.4-15.5+7

   = 20 – 75 + 7

   = – 55 + 7

   = – 48

   5) 60.(45-15)-45.(60-15)

   = 1800 – 2025

   = – 225

   6)85.(17-35)-18.(40-55)

   = – 1530 + 270

   = – 1260

   7) 2155-(174+2155)+(-68+174)

   = – 174 + 106

   = – 68

   8)-25.72+25.21-49.25

   = – 1800 +525 – 1225

   = – 1275 – 1225

   = – 2500

   9)8154-(674+8154)+(-98+674)

   = – 674 + 576

   = – 98

   10) 44.(-36)+22.(-28)

   = – 1584 – 616 

   = – 2200

        Chúc bn hc tốt !!

    

   Giải thích các bước giải:

    

   Trả lời