Toán 7 - lũy thừa của một số hữu tỉ
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Mathematics
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7th Grade
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Hard
Nguyễn Tâm
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by Nguyễn Tâm
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Lũy thừa bậc n của một số hữu tỉ x, kí hiệu
là tích của n thừa số x (n là một số tự nhiên lớn hơn 1)
xn = x.x.x...x (n thừa số x) với x, n N, n>1
Qui ước : x1 = x ; x0 = 1 ( x 0 )
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a) (- 3)2. (- 3)3
b) (-0,25)5: (-0,25)3
?2 Viết dưới dạng lũy thừa
a) (- 3)2. (- 3)3 = (- 3)5 ;
b) (-0,25)5: (-0,25)3= (-0,25)2
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a. Lũy thừa của một tích
?1 sgk
* Công thức: (x. y) n = xn. yn với n N
?2 Tính:
(1,5)3.8 = 1,53. 23= (1,5. 2)3= 27
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b. Luỹ thừa của một thương
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