Kunci Jawaban Matematika Kelas 7 Halaman 238 Ayo Kita Berlatih 3.5

TRIBUNPADANG.COM - Kunci Jawaban Matematika Kelas 7 Halaman 238 Ayo Kita Berlatih 3.5.

Sederhanakan bentuk-bentuk aljabar berikut.

1. (3b - bx) / (cx - 3c)
 
Jawaban :

= -b (x - 3) / c (x - 3)
= -b / c

2. (3b - bx) / (cx - 3c)
 
Jawaban :

= -b (x - 3) / c (x - 3)
= -b / c
 
3. 3/(x + 1) + 3/(x - 1)
 
Jawaban :

= 3(x - 1) + 3(x + 1) / (x + 1) ( x - 1)
= (3x - 3 + 3x + 3) / (x⊃2; - 1)
= 6x / (x⊃2; - 1)

4. x/(x + y) + y/(x - y)
 
Jawaban :

= x (x - y) + y (x + y) / (x + y) (x - y)
= (x⊃2; - xy + xy + y⊃2;) / (x⊃2; - y⊃2;)
= (x⊃2; + y⊃2;) / (x⊃2; - y⊃2;)

Baca juga: Kunci Jawaban Matematika Kelas 7 Halaman 289 Ayo Kita Menalar

5. 4a/3x - 4/2x
 
Jawaban :

= 4a(2x) - 4(3x) / (3x) (2x)
= (8ax - 12x) / 6x⊃2;
= (8a - 12) / 6x
= 2(4a - 6) / 2(3x)
= (4a - 6) / 3x

6. 2/(x + 3) - 3/(x - 2)
 
Jawaban :

= 2(x - 2) - 3(x + 3) / (x + 3) (x - 2)
= (2x - 4 - 3x - 9) / (x⊃2; + x - 6)
= (-x - 13) / (x⊃2; + x - 6)

7. (3x/2x) x (x - 4)/6x
 
Jawaban :

= (3x⊃2; - 12x) / 12x⊃2;
= 3x(x - 4) / 3x(4x)
= (x - 4) / 4x