10000(1+10%)^n=100000
(1+10%)^n=10
1.1^n=10
nlg1.1=1
n=1/lg1.1
≈24
10000x(1+10%)的n次方=1000001.1的n次方=10 两边取对数nlg1.1=1n=1÷lg1.1≈1÷0.04139≈24.16