Question

Afla necunoscutele de mai jos.

17mm X a - 15mm = 36mm
229dm X b + 43dm = 739dm
C HM - 23 HM X 3 = 178 HM
185 km : d + 9 km X 0 = 5 km
325 cm + 179 cm - 36 cm : e = 498cm
76 dam - 19 dam + f dam = 74 dam
129 m: 3 + 94 m - g m = 105 m

G,a,b etc... Sunt necunoscute.

Answer 1

17mm * a - 15mm = 36mm
17mm * a = 36mm + 15mm 
a = 51mm/17mm = 3mm
229dm * b + 73dm = 739dm
229dm * b = 739dm - 73dm
b = 666dm/229dm
c * hm - 23hm * 3 = 178hm
c * hm = 69hm + 178hm
c = 247hm
185km : d + 9km * 0 = 5km
185km = 5km * d  
d = 185km/5km = 37km
325cm + 179cm - 36cm : e = 498cm
438cm = 498cm * e
e = 438cm/498cm
e = 73cm/83cm
76dam - 19dam + f dam = 74dam
f dam = 74dam - 57dam
f = 17dam
129m : 3 + 94m - g m = 105m
43m + 94m - g m = 105m
g m = 137m - 105m
g = 32m 

Answer 2

17 mm × a - 15 mm = 36 mm
17 mm × a = 36 mm + 15 mm 
17 mm × a = 51 mm 
a = 51 mm : 17 mm 
a = 3 mm
------------------------------------
229 dm × b + 43 dm = 739 dm
229 dm × b = 739 dm - 43 dm 
229 dm × b = 696 dm 
b = 696 dm : 229 dm 
b = 3,039 

Daca exercitiul este pentru clasele primare, atunci voi modifica pe 229 cu 232 si voi obtine: 
232 dm × b = 739 dm - 43 dm 
232 dm × b = 696 dm 
b = 696 dm : 232 dm 
b = 3 
------------------------------------

c hm - 23 hm × 3 = 178 hm
c  - 69 hm = 178 hm 
c = 178 hm + 69 hm 
c = 247 hm 
------------------------------------

185 km : d + 9 km × 0 = 5 km
185 km : d + 0 = 5 km 
185 km : d = 5 km 
d = 185 km : 5 
d = 37 km 
-----------------------------------

325 cm + 179 cm - 36 cm : e = 498 cm
504 cm - 36 : e = 498 cm 
36 : e = 504 cm - 498 cm 
36 : e = 6 
e = 36 : 6 
e = 6 
----------------------------------

76 dam - 19 dam + f dam = 74 dam
57 dam + f = 74 dam 
f = 74 dam - 57 dam 
f = 17 dam 
--------------------------------------

129 m : 3 + 94 m - g m = 105 m
43 m + 94 m - g = 105 m 
137 m - g = 105 m 
g = 137 m - 105 m 
g = 32 m