Răspuns:
Explicație pas cu pas:
c)
201 × 327 - 201 × 307 + 201 × 23 =
= 201 × ( 327 - 307 + 23) =
= 201 × ( 20 + 23 ) =
= 201 × 43 =
= ( 200 + 1 ) × 43 =
= 200×43 + 1×43 =
= 8 600 + 43 =
= 8 643
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e)
1725 × 707 + 324 × 707 - 321 × 707 =
= 707 × ( 1725 + 324 - 321 ) =
= 707 × ( 2049 - 321 ) =
= 707 × 1 728 =
= ( 700+7) × 1728 =
= 700 × 1728 + 7 × 1728 =
= 1209600 + 12096 =
= 1 221 696
