Răspuns:
Explicație pas cu pas:
a) 24 × 36 + 24 × 14 = 24 × ( 36 + 14 ) = 24 × 50 = 1 200
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b) 35 × 144 - 30 × 144 = 144 × ( 35 - 30 ) = 144 × 5 = 720
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c)
28 × 36 + 28 × 14 - 28 × 50 = 0
= 28 × ( 36 + 14 - 50 ) =
= 28 × ( 50 - 50 ) =
= 28 × 0 =
= 0
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d)
128 × 25 - 13 × 128 + 128 = 1 664
= 128 × ( 25 - 13 + 1 ) =
= 128 × ( 12 + 1 ) =
= 128 × 13 =
= 1 664
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e)
225 × 27 - 27 × 100 + 27 = 3 402
= 27 × ( 225 - 100 + 1 ) =
= 27 × ( 125 + 1 ) =
= 27 × 126 =
= 3 402
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f)
2019 × 2020 + 2020 = 2020 × ( 2019 + 1 ) = 2020 × 2020 = 4 080 400
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g)
37 × 16 - 37 + 15 × 30 =
= 37 × ( 16 - 1 ) + 15 × 30 =
= 37 × 15 + 15 × 30 =
= 15 × ( 37 + 30 ) =
= 15 × 67 =
= 1005
