Giải vở bài tập Toán 7 chương I, bài 6: Lũy thừa của một số hữu tỉ - Luyện tập

Thứ năm - 24/10/2019 08:39
Hướng dẫn Giải vở bài tập Toán 7 chương I, bài 6: Lũy thừa của một số hữu tỉ - Luyện tập
Bài 1:
giai vbt toan 7 bai 6 cau 1

Bài 2:
giai vbt toan 7 bai 6 cau 2

Bài 3:
a) 108. 28 = (10.2)” = (20)8
b) 108:28 =(10:2)8 =58
c) 254 .28 = (52)4 .28 = 58 .28 =(2.5)8 = 108
d) 158.94 = 158 .(32)4 = 158 .38 = (15.3)8 =458
e) 272 :253 =(33)2 :(52)3 =36 : 56 =(3:5)6 =

Bài 4:
   a)  =  = = 1
giai vbt toan 7 bai 6 cau 4
LUYỆN TẬP
Bài 1.
a) 227 = (23)9 = 89
318 = (32)9 = 99
b) Vì 227 = 89, 318 = 99
mà 99 > 89 nên 318 > 227.

Bài 2.
a) x10 = x7.x3
b) x10 = (x2)5
c) x10 = x12 : x2

Bài 3:
giai vbt toan 7 bai 6 cau 3 
                              giai vbt toan 7 bai 6 cau 3     
Bài 4:
giai vbt toan 7 bai 6 cau 4b
Bài 5:
giai vbt toan 7 bai 6 cau 5
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