17 x 2 99 x 9 10 x 10 200 x 2000 1778×54 90×34 56×78

Question

17 x 2
99 x 9
10 x 10
200 x 2000
1778×54
90×34
56×78

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Arianna 4 tuần 2021-07-06T07:53:27+00:00 2 Answers 1 views 0

Answers ( )

    0
    2021-07-06T07:54:35+00:00

    17 x 2 = 34

    99 x 9 = 891

    10 x 10 = 100

    200 x 2000 = 400000

    1778 x 54 = 96012

    90 x 34 = 3060

    56 x 78 = 4368

    Gửi bạn. Lunangoctrang1

    0
    2021-07-06T07:54:51+00:00

    `17 xx 2`

    `= ( 10 + 7) xx2`

    `= 10 xx 2 + 7 xx 2`

    `= 20 + 14`

    `= 34`

    —————————

    `99 xx 9`

    `= (90 + 9) xx9`

    `= 90 xx 9 + 9 xx 9`

    `= 810 + 81`

    `= 891`

    —————————

    `10 xx 10`

    = `100`

    —————————

    `200 xx 2000`

    `= 400 000`

    —————————–

    `1778xx54`

    `= 1778 xx ( 50 + 4)`

    `= 1778 xx 50 + 1778 xx 4`

    `= 88900 + 7112`

    `= 96012`

    ——————————-

    `90xx34`

    `= 90 xx ( 30 + 4)`

    `= 90 xx 30 + 90 xx 4`

    `= 2700 + 360`

    `= 3060`

    —————————

    `56xx78`

    `= (50 + 6) xx 78`

    `= 50 xx 78 + 78 xx 6`

    `= 3900 + 468`

    `= 4368`

    ——————————————————————-

    `text{Rút gọn lại kết quả bài làm :}`

    `17 xx 2= 34`

    `99 xx 9 = 891`

    `10 xx 10 = 100`

    `200 xx 2 000 = 400 000`

    `1778 xx 54 = 96012`

    `90 xx 34 = 3060`

    `56 xx 78 =4368`

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