Dengan menggunakan sifat distributif ,selesaikan masing-masing bentuk aljabar di bawah ini: 1.-3 (2×+1) 2.4(×+3) 3.-12 (1/3a-1/4) 4. (5×-3/3).9 5.1/2(6×-5) 6.-(

Mapel : Matematika
Kelas : VII SMP
Bab : Aljabar dasar

Pembahasan :
1. -3(2x + 1)
= (-3)(2x) + (-3)(1)
= -6x - 3

2. 4(x + 3)
= (4)(x) + (4)(3)
= 4x + 12

3. -12(1/3a - 1/4)
= (-12)(1/3a) + (-12)(-1/4)
= -4a + 3

4. (5x - 3)/3 . 9
= (5x - 3) . 3
= (5x)(3) - (3)(3)
= 15x - 9

5. 1/2(6x - 5)
= (1/2)(6x) + (1/2)(-5)
= 3x - (5/2)

6. -(a - 4)
= (-1)(a) + (-1)(-4)
= -a + 4

7. 6(1/2x - 2/3)
= (6)(1/2x) + (6)(-2/3)
= 3x - 4

8. -1/3(5 - 3x)
= (-1/3)(5) + (-1/3)(3x)
= -5/3 - x

9. -3/4(-8x + 2)
= (-3/4)(-8x) + (-3/4)(2)
= 6x - (3/2)

10. (-9x - 3) . 2/3
= (-9x)(2/3) + (-3)(2/3)
= -6x - 2