Question

[Tumili]

Tìm x: (bài này trong đề thi của mikđo giải giùm nhe mà phải đúng nữa . Thanks )            2^x+4 + 2^x = 34

Bạn Trâm đánh dấu các số trang từ 1 -> 100. Hỏi cần bao nhiêu chữ số để đánh hết số trang ?

Answer 1

[CHU ANH TUẤN]

(=) 2^x.2⁴+2^x=34

(=) 2^x.(16+1)=34

(=) 2x.17     =34

(=) 2^x             =2

=) x = 1

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Answer 2

[Trần Viên Như]

Các số từ 1 đến 9 có 9 chữ số.

Các số từ 10 đến 99 có 90 số và có số chữ số là: 90 x 2 = 180 chữ số

Số 100 có 3 chữ số nên sẽ cần số chữ số là: 9 + 180 + 3 = 192 chữ số

Đáp số: 192 chữ số

Chúc bạn học tốt!