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求X的值如下1)2^x=92)2^x-3=3
题目详情
求X的值如下
1)2^x=9
2)2^x-3=3
1)2^x=9
2)2^x-3=3
▼优质解答
答案和解析
1)2^x=9
log2 2^x=log2 9
x=log2 9
2)2^x-3=3
2^x=6
log2 2^x=log2 6
x=log2 6
2)2^(x-3)=3
log2 2^(x-3)=log2 3
x-3=log2 3
x=log2 3+3
log2 2^x=log2 9
x=log2 9
2)2^x-3=3
2^x=6
log2 2^x=log2 6
x=log2 6
2)2^(x-3)=3
log2 2^(x-3)=log2 3
x-3=log2 3
x=log2 3+3
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