Tính nhanh: a, 12 x 5 + 20 x 2 b, 30 x 2 + 8 x 5 c, 15 x 6 + 2 x 5

Question

Tính nhanh:
a, 12 x 5 + 20 x 2
b, 30 x 2 + 8 x 5
c, 15 x 6 + 2 x 5

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Eloise 7 giờ 2021-09-07T11:54:16+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-09-07T11:55:38+00:00

    Đáp án:

     

    Giải thích các bước giải:

     a) 12 x 5 + 20 x 2  = 6 x 2 x 5 +5 x 4 x 2 = 10 x 6+10 x 4=10 x (6+4)=10 x 10=100

    b) 30 x 2 + 8 x 5 = 5 x 2 x 6 + 4 x 2 x 5 = 10 x 6 +10x 4 =10 x (6+4) = 10 x 10 =100

    c) 15×6 +2 x 5 =5 x 3 x 2 x 3 + 2 x 5 = 10 x 6 + 10 = 10 x (6 +1) = 10 x 7 = 70

    0
    2021-09-07T11:55:54+00:00

    `a, 12 xx 5 + 20 xx 2`

    `= 3 xx 20 + 20 xx 2`

    `= 20 xx (3+2)`

    `=20xx5=100`

    `b, 30 xx 2 + 8 xx 5`

    `= 5 xx 12 + 8 xx 5`

    `= 5 xx( 12 + 8 )`

    `= 5 xx20=100`

    `c, 15 xx 6 + 2 xx 5`

    `= 5 xx 18 + 2 xx 5`

    `= 5 xx (18 + 2)`

    `= 5 xx20=100`

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