Jawapan:
Lihat proses penyelesaian di bawah:
Penjelasan:
Pertama, tulis semula ungkapan di bawah radikal sebagai:
Sekarang, gunakan kaedah radikal ini untuk menulis semula ungkapan radikal dan selesaikan penyederhanaan:
Bagaimana anda memudahkan (4 + sqrt50) - (3-sqrt (8))?
= 1 + 7sqrt2 sqrt50 = 5sqrt2 dan sqrt8 = 2sqrt2 Persamaan menjadi (4 + 5sqrt2) - (3-2sqrt2) = 4 + 5sqrt2-3 + 2sqrt2 = 1 + 7sqrt2
Bagaimana anda mempermudahkan (1 / sqrt (a-1) + sqrt (a + 1)) / (1 / sqrt (a + 1) -1 / sqrt (a-1) (a-1) sqrt (a + 1) - (a + 1) sqrt (a-1)), a> 1?
Memformat matematik besar ...> warna (biru) ((1 / sqrt (a-1) + sqrt (a + 1)) / (1 / sqrt (a + 1) -1 / sqrt (a-1) (a + 1) - (a + 1) sqrt (a-1))) = warna (merah) (((1 / sqrt (a- 1) + sqrt (a + 1)) / (sqrt (a-1) -sqrt (a + 1)) / (sqrt (a + 1) cdot sqrt (a-1) Cdot sqrt (a-1) cdot sqrt (a-1) cdot sqrt (a + 1) -sqrt (a + 1) cdot sqrt (a + 1) biru) (/ (1 / sqrt (a-1) + sqrt (a + 1)) / ((sqrt (a-1) -sqrt (a + 1)) / (sqrt (a + 1) cdot sqrt -1)))) / (sqrt (a + 1) / (sqrt (a + 1) cdot sqrt (a-1) (sqrt (a-1) -sqrt (a + (1 / sqrt (a-1) + sqrt (a + 1)) / sqrt (a-1) -sqrt (a + 1) sqrt (a-1) (sqrt (a-1) -sqrt (a + 1))) / sqrt (a + 1) =
Sederhana ungkapan: 1 / (sqrt (144) + sqrt (145)) + 1 / (sqrt (145) + sqrt (146)) + ... + 1 / (sqrt (168) + sqrt (169))
1 Nota Pertama: 1 / (sqrt (n + 1) + sqrt (n)) = (sqrt (n + 1) -sqrt (n)) / ((sqrt (n + 1) (n / 1) -sqrt (n)) warna (putih) (1 / (sqrt (n + 1) + sqrt (n) n + 1) -n) warna (putih) (1 / (sqrt (n + 1) + sqrt (n))) = sqrt (n + 1) -sqrt sqrt (145)) + 1 / (sqrt (145) + sqrt (146)) + ... + 1 / (sqrt (168) + sqrt (169) (sqrt (146) -sqrt (145)) + ... + (sqrt (169) -sqrt (168)) = sqrt (169) -sqrt (144) = 13-12 =