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afla valoarea necunoscutelor
a) 1000 -d x 2-25 x 4=800

b) e- 40 :2+ 29 x 4 =132

c) f:7+ 25=900-(300-48 x 5)x 9

1000 - d × 2 - 25 × 4 = 800

1000 - d × 2 - 100 = 800

1000 - d × 2 = 800 + 100

1000 - d × 2 = 900

d × 2 = 1000 - 900

d × 2 = 100

d = 100 : 2

d = 50

e - 40 : 2 + 29 × 4 = 132

e - 20 + 116 = 132

e - 20 = 132 - 116

e - 20 = 16

e = 16 + 20

e = 36

f : 7 + 25 = 900 - ( 300 - 48 × 5 ) × 9

f : 7 + 25 = 900 - ( 300 - 240 ) × 9

f : 7 + 25 = 900 - 60 × 9

f : 7 + 25 = 900 - 540

f : 7 + 25 = 360

f : 7 = 360 - 25

f : 7 = 335

f = 335 × 7

f = 2.345

Răspuns:

a) 1000-d • 2-100=800

1000-d•2=800+100

1000-d•2=900

d•2=1000-900

d•2=100

d=100:2

d=50

b) e-40:2+29•4=132

e-20+116=132

e-20=132-116

e-20=16

e=16+20

e=36

scuze pe c nu il pot rezolva