27 × 101
= 27 × (100 + 1)
= 27 × 100 + 27 × 1
= 2 700 + 27
= 2 727
99 × 57
= (100 - 1) × 57
= 100 × 57 - 1 × 57
= 5 700 - 57
= 5 643
je te laisse faire le dernier sachant que 1 002 = 1 000 + 2
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27 × 101
= 27 × (100 + 1)
= 27 × 100 + 27 × 1
= 2 700 + 27
= 2 727
99 × 57
= (100 - 1) × 57
= 100 × 57 - 1 × 57
= 5 700 - 57
= 5 643
je te laisse faire le dernier sachant que 1 002 = 1 000 + 2