Question

Ex 4 si 2, complete din poza(obligatoriu 4, tot):

Answer 1

Explicație pas cu pas:

2) a+b+c+d+e = 1200

a/2 = b/3 = c/4 = d/5 = e/6 = K

a= 2k

b = 3k

c= 4k

d= 5k

e= 6k

2k + 3k + 4k + 5k + 6k = 1200

20k = 1200, k = 1200 : 20 = 60

a = 2×60 = 120

b = 3×60 = 180

c= 4×60 = 240

d = 5×60 = 300

e= 6×60 = 360

4)

a) 3-2-5 = 1-5 = - 4

b) 6-6 = 0

c) - 1-5 = - 6

d) - 8 - 4 = - 12

e) 3+2 = 5

f) 5-7 = - 2

g) 4-8 = - 4

h) |4-6| = | - 2| = 2

i) - 1 +3 × [-3-2 ×( - 1-2)]^2 = - 1 +3 ×[3-2×(-3)]^2 =

- 1+3×(3+6)^2 = - 1 + 3 × 9^2 = - 1 +3 × 81 = - 1 + 243 = 242

j) [(-4)^2 - 12 - 8 - 3] ^3= (16 - 12 - 8 - 3) ^3 = (4 - 8 - 3)^3 = (-4-2)^`3 = (-6)^3 = - 216