Mathematics
Senior High
計算過程をおしえてほしいです
お願いします
+1)(k +2)
1
− (k + 1){(k + 1) + 1} = =½ k (k + 1)(k + 2) + (k + 1)(k + 2)
とき
°
¹²
(k + 1)(k + 2)(k + 3)
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