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Soal nomor 3
3/(x + 1) + 3/(x - 1)=
= 3(x - 1) + 3(x + 1) / (x + 1) ( x - 1)
= (3x - 3 + 3x + 3) / (x² - 1)
= 6x / (x² - 1)
Soal nomor 4
x/(x + y) + y/(x - y)=
= x (x - y) + y (x + y) / (x + y) (x - y)
= (x² - xy + xy + y²) / (x² - y²)
= (x² + y²) / (x² - y²)
Soal nomor 5
4a/3x - 4/2x =
BERITA REKOMENDASI
= 4a(2x) - 4(3x) / (3x) (2x)
= (8ax - 12x) / 6x²
= (8a - 12) / 6x
= 2(4a - 6) / 2(3x)
= (4a - 6) / 3x
Baca juga: Kunci Jawaban Matematika Kelas 7 Halaman 272 273 274, Selesaian Persamaan Perkalian dan Pembagian
Soal nomor 6
2/(x + 3) - 3/(x - 2)=
= 2(x - 2) - 3(x + 3) / (x + 3) (x - 2)
= (2x - 4 - 3x - 9) / (x² + x - 6)
= (-x - 13) / (x² + x - 6)
Soal nomor 7
(3x/2x) x (x - 4)/6x=