Bab 1 Fungsi, Persamaan, dan Pertidaksamaan Eksponensial
LKS 1
Soal dan Jawaban Matematika Kelas X Sukino
B. Evaluasi Pemahaman dan Penguasaan Materi
4. Sederhanakanlah.
a. 3x + 4 . 5x + 1 . 152x - 1
b. 63x + 1 . 8x - 1 . 243x - 1
c. 5x + 7 . 252x - 1 : 1252-x
d. 2x - 1 . 43x - 2 : 322x + 1
e. (6x . 122x + 2 ) : (27x . 323x)
f. 20x + 3 . 152x + 5 . 62x - 1
Jawaban :
a. 3x + 4 . 5x + 1 . 152x - 1
= 3x 34 . 5x 51 . 52x - 1. 32x - 1
= 3x + 4 + 2x - 1 5x + 1 + 2x - 1
= 33x+3 53x
b. 63x + 1 . 8x - 1 . 243x - 1
= 23x + 1 33x + 1 . 23x - 3 . 29x - 333x - 1
= 23x + 1 + 3x - 3 + 9x - 3 . 33x + 1 + 3x - 1
= 215x - 5 36x
c. 5x + 7 . 252x - 1 : 1252-x
= 5x + 7 . 54x - 2 . 5-6+3x
= 5x + 7 + 4x - 2 - 6 + 3x
= 58x -1
d. 2x - 1 . 43x - 2 : 322x + 1
= 2x - 1 . 26x - 4 . 2-10x - 5
= 2x - 1 + 6x - 4 -10x - 5
= 2-3x - 10
e. (6x . 122x + 2 ) : (27x . 323x)
= (2x 3x . 32x + 2 42x + 2 ) . (27-x . 32-3x)
= 2x 3x . 32x + 2 24x + 4 3-3x . 2-15x
= 2x+4x + 4-15x .3x+2x + 2-3x
= 2-10x + 4.32
f. 20x + 3 . 152x + 5 . 62x - 1
= 4x + 3 . 5x + 3 . 52x + 5 . 32x + 5 . 22x - 1 32x - 1
= 22x + 6 . 5x + 3 . 52x + 5 . 32x + 5 . 22x - 1 32x - 1
= 22x + 6+2x - 1. 5x + 3+2x + 5 . 32x + 5+2x - 1 = 24x + 5 . 34x + 4 . 53x + 8
>>Soal 5
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