1.-2 a^3 b^-2
2.1/a^-1+b^-2
3.(-4a^b^4)^3:(64a n^2)^2
4.5^3 x^5 kali 5^2 y^4
Jawaban:
1. (2a – 3b) (2a – 3b)
4a² – 6ab – 6ab + 9b²
4a² -12ab + 9b²
2. METODE ELIMINASI
1/a – 1/b = 1/2
1/a + 1/b = 1/5
___________+
2/a = 7/10
a = 20/7
a => 20/7
1/a – 1/b = 1/2
1/(20/7) – 1/b = 1/2
7/20 – 1/b = 1/2
– 1/b = 1/2 – 7/20
– 1/b = 10/20 – 7/20
– 1/b = 3/20
b = – 20/3
Hasil :
1/a² – 1/b²
1/(20/7)² – 1/(-20/3)²
1/(400/49) – 1/(400/9)
49/400 – 9/400
40/400
1/10
Opsi => E.
LEARNTOGETHER
3. 4a + b – 2c = 1 (2)
3a – 2b +4c =20(1) hasilnya
8a + 2b – 4c =2
3a -2b + 4c = 20
______________+
11 a = 22
a= 2
-2 + 7b +c = -6, 7b + c = -4
8 +b – 2c = 1, b – 2c = -7
7b + c =-4 ( 2 )
b – 2c = -7 ( 1 ) menjadi
14b + 2c = -8
b – 2c = -7
___________+
15 b = -15
b = -1
-2 -7+c = -6
c = 3
Hp( 2, -1 , 3 )
4. (5^3 x^5 y) x (5^2 y^4) =
= (125x^5 y) x (25y^4)
= 3125 x^5 y^5
e. (7p³q²r) x (1/4 p^4 a r^6) =
= (7p³q²r) x (1/4 ap^4 r^6)
= 7/4 ap^7 q² r^7
Penjelasan:
maaf kalau salah