配套习题- 换底公式及应用 -【青果学院】

1/4单选题

难度：

1.

（）

A	1
B	2
C	3
D	4

正确答案：QQ==

6Kej5p6Q77ya55Sx5YWs5byP77yaPGltZyB3aWR0aD0xMjIgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMEUvOUUvckJBQ0ZGUWZjWmlpellENEFBQURDRVVQbFE4NzkwLnBuZyI+77yM5Y+v5Lul55+l6YGTPGltZyB3aWR0aD0xMzkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMUEvODMvckJBQ0UxUWZjWm1nVUNfZEFBQUMyYjA3Yng4MDc0LnBuZyI+LDxicj7miYDku6U8aW1nIHdpZHRoPTEzOCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8xQS84My9yQkFDRTFRZmNabWpDbVIxQUFBQ3NYelFVNU0zMDMucG5nIj4=

2/4单选题

难度：

2.

的值为（）

A
B
C
D

正确答案：RA==

6Kej5p6QOiDnlLHmjaLlupXlhazlvI/nmoTmjqjorrrlj6/nn6XvvJo8aW1nIHdpZHRoPTE1NSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8xQS84My9yQkFDRTFRZmNhSGhBZUx5QUFBRFNhV043MW8wNDcucG5nIj4s5Y+v55+lLDxpbWcgd2lkdGg9MTQ2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzBFLzlFL3JCQUNGRlFmY2FHUXFCU0dBQUFDX0F4aWxaNDAxOS5wbmciPjxpbWcgd2lkdGg9MTEzIGhlaWdodD02MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzFBLzgzL3JCQUNFMVFmY2FHVGJZTVdBQUFDMlVOQ3NkNDg4Ny5wbmciPg==

3/4单选题

难度：

3.若lg5=a，lg7=b，则log₅7=()

A
B
C
D

正确答案：RA==

6Kej5p6Q77ya5qC55o2u5o2i5bqV5YWs5byP77yaPGltZyB3aWR0aD0xMjkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMUEvODQvckJBQ0UxUWZjYV9oRUlEaEFBQUR0bFhHTmg0NDIxLnBuZyI+5Y+v55+l77yMPGltZyB3aWR0aD0xMDQgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMEUvOUUvckJBQ0ZGUWZjYkNEcTl4SUFBQUMtd1JlVnNBODU1LnBuZyI+

4/4单选题

难度：

4.设3^a=4^b=m，且

=2，则m=( )

A	12
B	2
C	4
D	48

正确答案：Qg==

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