Question

А)798×349-798×249= б)57×-8640÷24+66= в)5²+3³=

Answer 1

А)
1) 798×349= 278502;
2) 798×249= 198702;
3) 278502-198702= 79800.
б)
1) 57×(-8640)= -492480;
2) -492480÷24= −20520;
3) -20520+66= −20454.
в) 25+27= 52.

Answer 2

a)

To solve the expression:

798×349-798×249

We can factor out 798:

798 × (349 - 249)

Then simplify the expression within the parentheses:

798 × 100

Finally, we can multiply to get the solution:

79800

Therefore,

798×349-798×249 = 79800

b)

To solve the expression:

57×-8640÷24+66

We need to perform the division first:

57 × (-360)

Then, we can add 66:

-20520 + 66

Finally, we can simplify to get the solution:

-20454

Therefore,

57×-8640÷24+66 = -20454

c)

To solve the expression:

5²+3³

We can evaluate the exponents first:

5² = 25 3³ = 27

Then, we can add to get the solution:

25 + 27

Finally, we can simplify:

52

Therefore,

5²+3³ = 52