Question

va rog nu mao stergeti temaaa !!! Dau corana! Ex.18,19,20

Answer 1

18/

a+b+c+d = 740

b = a+2

c = b+2

d = c+2

a |__|

b |__|.2|

c |__|.2|.2|

d |__|.2|.2|.2|

2 x 6 = 12

740 - 12 = 728

728 : 4 = 182 = a

b = 182+2 = 184

c = 184+2 = 186

d = 186+2 = 188

nr sunt : 182, 184, 186, 188

xx Suma a patru numere consecutive impare este 136. Afla numerele.

a+b+c+d = 136

b=a+2

c = b +2,

d = c + 2

a+b+c+d = 136

b = a+2

c = b+2

d = c+2

a |__|

b |__|.2|

c |__|.2|.2|

d |__|.2|.2|.2|

2 x 6 = 12

136 -12 = 124

124 : 4 = 31 = a

b = 31+2=33

c = 33+2 = 35

d = 35+2 = 37

19/

p = 128

l = 1/3 x L

 P = 2 x l + 2 x L

128 = 2  L /3 +2 L

128 =( 2L + 6L) / 3

2L+6L = 128X 3

8 L = 384

L = 357 : 8

L = 48

l = 1/ 3 x 48

l = 48:3

l = 16

20/

P = 86 m

L = l +8

P = 2l +2 L

86 = 2l +2 (l+8)

86 = 2l +2l+16

86 - 16 = 4l

70 = 4l

l = 70:4

l = 17,5

L = 17,5+8

L = 25,5