0 72 Fisa de Lucru
1
Fișă de lucru - Clasa a VII-a Calcule cu numere reale reprezentate prin litere I. Calculati: 1. 7 a+8 b−3 a+5 b +a = 2. ( − 7 ab 2 ) ⋅ ( − 3 ab 3 ) = 3. ( − 8 ab 4 ) : (5 ab 3 ) = 4. ( − 2 ab 2 ) 2 = 5. 4 x 2 : 2xy= 6. (-2xy 2 ) 2 = 7. ( 3 x 2 +5 x +7 )+( x 2 −6 )= 8. (10x+7y) – ( 4 x-10y) = 9. (x+1) ( x - 1) = 10. 3x – 5x + 7x -2 +8 x – 10 y - 6= 11. 2x 2 : x + x + 3 = 12. −2 √ 2 a+5 √ 2 b−7 √ 2 a− √ 50 b= 13. x ( x – 3) – x 2 + 2x ( x + 1) = 14. ( 2a – 5) (2a + 5) = 15. (21x 3 – 14x 2 +7x) : (-7x) + (x – 1)(x + 2) = 16. 2(x – y + 3) – 3(y – x + 1) + (+2y – 3x) = 17. (x + 2)(x – 3)-(x-6)(x+7) = 18. (8x 4 – 40x 3 + 28x 2 ) : (4x 2 ) – 2(x + 2) = 19. √ 3 x( √ 3− 1 √ 3 )+ √ 2 x ( 2 √ 2− 4 √ 2 )+ √ 5 x ( √ 5− 2 √ 5 )= 20. (x + 2)(x 2 - x + 3) - (x + 1)(x 2 + 2x - 5)= II. Calculați aria unui pătrat care are perimetrul egal cu 24a 2 b 3 c, unde a,b,c єN *
Transcript of 0 72 Fisa de Lucru
Fișă de lucru - Clasa a VII-aCalcule cu numere reale reprezentate prin litere
I. Calculati:
1. 7a+8b−3 a+5b+a=
2. (−7 ab2 )⋅(−3ab3) =
3. (−8 ab4 ) : (5ab3 )=
4. (−2ab2 )2 =
5. 4 x2 : 2xy=
6. (-2xy2)2 =
7. (3 x2+5 x+7 )+(x
2−6 )=
8. (10x+7y) – ( 4 x-10y) =
9. (x+1) ( x - 1) =
10. 3x – 5x + 7x -2 +8 x – 10 y - 6=
11. 2x2 : x + x + 3 =
12. −2√2a+5√2b−7√2a−√50b=
13. x ( x – 3) – x 2 + 2x ( x + 1) =
14. ( 2a – 5) (2a + 5) =
15. (21x3 – 14x2 +7x) : (-7x) + (x – 1)(x + 2) =
16. 2(x – y + 3) – 3(y – x + 1) + (+2y – 3x) =
17. (x + 2)(x – 3)-(x-6)(x+7) =
18. (8x4 – 40x3 + 28x2) : (4x2 ) – 2(x + 2) =
19.√3 x( √3− 1
√3)+√2 x(2√2− 4
√2)+√5 x (√5− 2
√5)=
20. (x + 2)(x2- x + 3) - (x + 1)(x2 + 2x - 5)=
II. Calculați aria unui pătrat care are perimetrul egal cu 24a2 b3 c, unde a,b,c єN*
