25 × 99 = 25 × (100 - 1)
= 25 × 100 - 25 × 1
= 2 500 - 25
= 2 475
15 × 102 = 15 × (100 + 2)
= 15 × 100 + 15 × 2
= 1 500 + 30
= 1 530
je te laisse faire le dernier sachant que 999 = 1 000 - 1
bonjour
B) 25 x 99 = 25 (100 - 1) = 25 x 100 - 25 x 1 = 2500 - 25 = 2475
C) 15 x 102 = 15(100 + 2) = 15 x 100 + 15 x 2 = 1500 + 30) = 1530
D) 5 x 999 = 5(1000 - 1) = 5 x 1000 - 5 x 1 = 5000 - 5 = 4995
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25 × 99 = 25 × (100 - 1)
= 25 × 100 - 25 × 1
= 2 500 - 25
= 2 475
15 × 102 = 15 × (100 + 2)
= 15 × 100 + 15 × 2
= 1 500 + 30
= 1 530
je te laisse faire le dernier sachant que 999 = 1 000 - 1
Verified answer
bonjour
B) 25 x 99 = 25 (100 - 1) = 25 x 100 - 25 x 1 = 2500 - 25 = 2475
C) 15 x 102 = 15(100 + 2) = 15 x 100 + 15 x 2 = 1500 + 30) = 1530
D) 5 x 999 = 5(1000 - 1) = 5 x 1000 - 5 x 1 = 5000 - 5 = 4995