Question

Cat mai multe exercitii cat mai bine. (mai mult de 4 daca se poate, 4+ exercitii= coroana)

Answer 1

Răspuns:

1.

A={-5,-4,-3,-2,-1,0,1}

B={-3}

C={-3,-2,-1,0,1,2,3}

D={-2,-1,0,1,2,3}

2.

x/2=y/3=z/4=t/5=u/6=k

x=2k

y=3k

z=4k

t=5k

u=6k

20k=1200

k=60

x=120

y=180

z=240

t=300

u=360

3.

2a=3b=4c=k

a=k/2

b=k/3

c=k/4

k^2/4 + k^2/9 + k^2/16 = 976

4=2^2

9=3^2

16=2^4

cmmmc=2^4×3^2=144

36k^2 + 16k^2 + 9k^2 = 976×144

61k^2 = 976×144

k^2 = 2304 =>k=48

a=24

b=16

c=12

4.

a)(-4)

b)0

c)(-6)

d)(-4)

e)5

f)(-2)

g)12

h)2

i)26

j)(-1)

6.

Pe foaie.