trả lời dùm đi mình đang gấp mình cần 10 phút nữa

chỉ còn 9 phút nữa 

225/143 nha ban

158692,1211

225/143

\(A=\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}+\frac{1}{256}+\frac{1}{512}\)

\(=\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+....+\frac{1}{256}-\frac{1}{512}\)

\(=\frac{1}{2}-\frac{1}{512}\)

\(=\frac{255}{512}\)

Vậy \(A=\frac{255}{512}\)

A=14 +18 +116 +132 +164 +1128 +1256 +1512 

=12 −14 +14 −18 +....+1256 −1512 

=12 −1512 

=255512 

Vậy A=255512 

Phạm Long Khánh

A = 255/512

\(A=\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}+\frac{1}{256}+\frac{1}{512}\)

\(=\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-....+\frac{1}{256}-\frac{1}{512}\)

\(=\frac{1}{2}-\frac{1}{512}\)

\(=\frac{255}{512}\)

Vậy \(A=\frac{255}{512}\)

=1/2-1/4+1/4-1/8+1/8-....+1/156-1/152

=1/2-1/152

=255/512

A=255/512

\(A=\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}+\frac{1}{256}+\frac{1}{512}\)

\(A=\frac{2-1}{4}+\frac{2-1}{8}+\frac{2-1}{16}+\frac{2-1}{32}+\frac{2-1}{64}+\frac{2-1}{128}+\frac{2-1}{256}+\frac{2-1}{512}\)

\(A=\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+...+\frac{1}{256}-\frac{1}{512}\)

\(A=\frac{1}{2}-\frac{1}{512}\)

\(A=\frac{256}{512}-\frac{1}{512}=\frac{255}{512}\)

so trang co 1 chu so :9 

so trang co hai chu so: 90

so trang co 3 chu so :157

tong so cgu so can dung la: 9+90x2+157x3=660

Số trang có 2 chữ số là: 

            9 ( trang )

Số trang có 2 chữ số là: 

              90 ( trang )

Số trang có 3 chữ số là:

           157 ( trang ) 

Tổng số chữ số để đánh hết cuốn sổ tay là:

        9 x 1 + 90 x 2 + 157 x 3 

      = 9 + 180 + 471

     = 189 + 471

    =  660

k mik đi nhak mik ko giải rõ ràng dc vì mik đang có việc riêng        TẶNG BN NÈ HÌNH TƯỢNG MIK ĐÓ

= 128/256 + 64/256 + 32/256 + 16/256 + 8/256 + 4/256 + 2/256 + 1/256 

= 255/256

q​uy đ​ồ​ng mẫ​u số​ bạ​n nhé​. Mẫ​u số chung = 256

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sồ trang từ 1->9 có tổng cộng 9 chữ số

số các số từ 10->99 là (99-10):1+1=90 (số)

số trang từ 10->99 có tổng cộng 90 nhân 2 = 180 chữ số

số  các số từ 100 ->265  là (265-100):1+1=166 (số)

số trang từ 100->265 có tổng cộng 166 nhân 3 = 498 chữ số

em phải đánh số chữ số là : 9+180+498=587 chữ số

a) \(\sqrt{x^8}=256\)

\(\Leftrightarrow\sqrt{\left(x^4\right)^2}=256\)

\(\Leftrightarrow x^4=256\)

\(\Leftrightarrow x^4=\left(\pm4\right)^4\)

\(\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-4\end{matrix}\right.\)

b) \(\sqrt{x^2-2x+1}=x-1\) (x≥1)

\(\Leftrightarrow\sqrt{\left(x-1\right)^2}=x-1\)

\(\Leftrightarrow\left|x-1\right|=x-1\)

Mà: \(x\ge1\Rightarrow x-1\ge0\)

\(\Leftrightarrow x-1=x-1\)

\(\Leftrightarrow0=0\) (luôn đúng)

Vậy pt thỏa mãn với mọi x đk x ≥ 1