Question

А)79^2-21^2 б) 17,8^2-7,8​

Answer 1

Ответ:

Объяснение:

а)79^2-21^2=6241-441=5800

б)17,8^2-7,8​=316,84-7.8=309,04

Answer 2

А)6241-441=5800
Б)316,84-7,8=309,04

Answer 3

Let's calculate the given expressions:

a) To calculate $79^2 - 21^2$:

$79^2 = 79 \times 79 = 6241$ (square of 79)

$21^2 = 21 \times 21 = 441$ (square of 21)

Now, subtracting the squares: $79^2 - 21^2 = 6241 - 441 = 5800$.

Therefore, $79^2 - 21^2 = 5800$.

b) To calculate $17.8^2 - 7.8$:

$17.8^2 = 17.8 \times 17.8 = 316.84$ (square of 17.8)

Now, subtracting $7.8$ from $316.84$: $17.8^2 - 7.8 = 316.84 - 7.8 = 309.04$.

Therefore, $17.8^2 - 7.8 = 309.04$.