Question

vă rog ajutati-ma la exercițiul 12​

Answer 1

a) 125

b) 80

c) 45

d) 50

e) 23,4

f) 143

g) 72

h) 8,1

i) 54

j) 320

Answer 2

Răspuns:

Explicație pas cu pas:

Metoda reducerii la unitate (regula de trei simplă)

a)

500............100%

x.................25%

x = 500 × 25 ÷ 100 = 12500 ÷ 100 = 125

b)

200............100%

x.................40%

x= 200 × 40 ÷ 100 = 8000 ÷ 100 = 80

c)

225............100%

x.................20%

x = 225 × 20 ÷ 100 = 4500 ÷ 100 = 45

d)

1000..........100%

x.................5%

x = 1000 × 5 ÷ 100 = 5000 ÷ 100 = 50

e)

234............100%

x.................10%

x = 234 × 10 ÷ 100 = 2340 ÷ 100 = 23,4

f)

286............100%

x.................50%

x = 286 × 50 ÷ 100 = 14300 ÷ 100 = 143

g)

300............100%

x.................24%

x = 300 × 24 ÷ 100 = 7200 ÷ 100 = 72

h)

27..............100%

x.................30%

x = 27 × 30 ÷ 100 = 510 ÷ 100 = 5,1

i)

90..............100%

x.................60%

x = 90 × 60 ÷ 100 = 5400 ÷ 100 = 54

j)

400............100%

x.................80%

x = 400 × 80 ÷ 100 = 32000 ÷ 100 = 320