1. Tính nhanh a) 15+23+(-25)+(-23) b)-17+50+17+(-50) c) 48+(-12)+(-48)+12 d) -23 . 63+23 . 21 – 58 e) -25 . 53+25 . 17+25 . 17 . 22 f) -27 . 48+27 . 6

Question

1. Tính nhanh
a) 15+23+(-25)+(-23)
b)-17+50+17+(-50)
c) 48+(-12)+(-48)+12
d) -23 . 63+23 . 21 – 58
e) -25 . 53+25 . 17+25 . 17 . 22
f) -27 . 48+27 . 62 – 27 . 10

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Harper 3 tuần 2021-07-11T13:39:23+00:00 1 Answers 1 views 0

Answers ( )

    0
    2021-07-11T13:41:10+00:00

    a) 15+23+(-25)+(-23)

    =(15-25)+(23-23)

    =-10+0

    =-10

    b)-17+50+17+(-50)

    =(-17+17)+(50-50)

    =0+0

    =0

    c) 48+(-12)+(-48)+12

    =(48-48)+(-12+12)

    =0+0

    =0

    d) -23 . 63+23 . 21 – 58

    =23.(-63+23)-58

    =-23.40-58

    =-920-58

    =-978

    e) -25 . 53+25 . 17+25 . 17 . 22

    =-25 . 53+25 . 17+25 . 374

    =25.(-53+17+374)

    =25.338

    =8450

    f) -27 . 48+27 . 62 – 27 . 10

    =27.(-48+62-10)

    =27.4

    =108.

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