Tính nhanh: a, 12 x 5 + 20 x 2 b, 45 x 2 + 2 × 5

Question

Tính nhanh:
a, 12 x 5 + 20 x 2
b, 45 x 2 + 2 × 5

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Raelynn 3 tháng 2021-09-07T13:59:19+00:00 2 Answers 5 views 0

Answers ( )

    0
    2021-09-07T14:00:23+00:00

    a, 12 x 5 + 20 x 2

    = 60 + 40 

    = 100

    b, 45 x 2 + 2 × 5

    = 2 x ( 45 + 5 ) 

    = 2 x 50 

    = 100

     

    0
    2021-09-07T14:00:35+00:00

    a, 12 x 5 + 20 x 2

    = 60 + 40

    = 100

    b, 45 x 2 + 2 × 5

    = 90 + 10 

    = 100

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