Calcule cu numere reprezentate prin litere -cl.VIII-a Sc.N.Russu
Authored by Stoica Catalina
Mathematics
8th Grade
Used 34+ times
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9 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Rezultatul calculului 3xy + 15x3 - 34xy - 12x3 + 5x3 este
-37xy+17x3
18x3 -31xy
-31xy + 8 x3
20x3 - 30xy
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Efectuând înmulțirea -3x3y2z ⋅(+7xy4 ) se obține
-21x3y2z5
-21x3y6z
+21xyz
-21x4y6z
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Rezultatul împărțirii (3x3 +11x3 - 34x3) : (- 5x ) este
+4x2
-4x2
+4x3
-5x3
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ridicând la putere (3x2y5z)3 se obține
9x5y8z3
27x6y8z
27x6y15z3
27x6y8z
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculând expresia E(x) = (2x+1)2 - (x-1)2+(x-2)(x+2)-3x2+14 se obține
x2 + 4x +12
x2 - 4x +12
-x2+4x+12
x2+4x+ 8
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Folosind diferența de pătrate pentru 25 - 64a2 se obține
(5-8a)2
(5+8a)2
(5+8a)(5-8a)
(5 +16a)(5 -16a)
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Restrângând la pătratul unei sume expesia E(x)=25x2 - 30xy + 9y2 , obținem
(5x-3y)5x+3y)
(5x+3y)2
(5x+3y2)2
(5x-3y)2
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