Question

Oblicz korzystajac ze wzoro skroconego mnozenia .

1. (0,3x -4)do kwadratu =

2. ( 0,3 - 0,2a)do kwadratu =

3. (1/2 x - 1/3) (1/2x + 1/3)=

4. ( 2i 1/2 - a) (a+2 i 1/2) =

5. ( 0,07 - 2a) (2a+0,07)=

6. (-3 i 1/2) do kwadratu =

7. 1 i 8/9 * 2 i 1/9 =

8. -3 i 2/5 * 2 i 3/5 =

9. 1999 do kwadratu

10. 78*82 =

Answer 1

 1.  (0,3x -4)²=0,09x²-2,4x+16

2.  ( 0,3 - 0,2a)²=0,09-0,12a+0,04a²

3. (1/2 x - 1/3) (1/2x + 1/3)=1/4x²-1/9

4. ( 2i 1/2  - a) (a+2 i 1/2) =(-a+5/2)(a+5/2)=-(a-5/2)(a+5/2)=-a²+25/4=-a²+6 1/4

5.  ( 0,07 - 2a) (2a+0,07)=0,0049-4a²

6.  (-3 i 1/2)²=(-7/2)²=49/4=12 1/4

7.  1 i  8/9 * 2 i 1/9 =17/9*19/9=323/81=3 80/81

8. -3 i 2/5 * 2 i 3/5 = - 17/5 * 13/5=- 221/25=-8 21/25

9. 1999²=3996001

10.  78*82  =6396

Answer 2

1. (0,3x - 4)^2 = 0,09x^2 - 2,4x + 16

2. (0,3 - 0,2a)^2 = 0,09x^2 -0,12a + 0,04a^2

3. (1/2x-1/3)(1/2x+1/3) = 1/4x^2 +1/6x - 1/6x -1/9= 1/4x^2 -1/9

4. (2i1/2-a)(a+2i1/2) = (5/2-a)(a+5/2)= 5/2a+25/4-a^2-5/2a = 25/4 - a^2

5. (0,07 -2a)(2a+0,07)= 0,14a+0,0049-4a^2 -0,14a  = 0,0049 - 4a^2

6. (-3i1/2)^2 = (-3,5)^2 = 12,25

7. 1i8/9 * 2i1/9 = 17/9 * 19/9 = 323/81 = 3 i 80/81

8. -3i2/5 * 2 i 3/5 = -3,4 * 2,6 = - 8 ,84

9. 1999^2 = 3 996 001

10. 78 * 82 = 6 396