Question

vă rog toate 3 ex dau coroană . Urgent!!!!!​

Answer 1

ab + ac + 2a = 250

a(b + c) + 2a = 250

8a + 2a = 250

10a = 250

a = 25

4 + 8 + ... + 2004 =

= 4(1 + 2 + .. + 501)

= 4×501×502 : 2

= 503004

n : 12 = 15, rest 8

n = 12×15 + 8

n = 180 + 8

n = 188

Answer 2

3.

ab+ac+2a = 250

a(b+c)+2a = 250

8a+2a = 250

10a = 250

a = 250:10

a = 25

4.

4+8+12+16+...+2004 =

2(2+4+6+8+...+1002) =

4(1+2+3+4+...+501) =

4•(501•502)/2 =

4•501•251 =

2004•251 =

503004

5.

x:12 = 15 rest 8

x = 12•15+8

x = 188