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Trả lời
\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=\frac{23}{16}\)
\(\Leftrightarrow\left(x+x+x+x\right)+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=\frac{23}{16}\)
\(\Leftrightarrow4x+\left(\frac{8}{16}+\frac{4}{16}+\frac{2}{16}+\frac{1}{16}\right)=\frac{23}{16}\)
\(\Leftrightarrow4x+\frac{8+4+2+1}{16}=\frac{23}{16}\)
\(\Leftrightarrow4x+\frac{15}{16}=\frac{23}{16}\)
\(\Leftrightarrow4x=\frac{23}{16}-\frac{15}{16}\)
\(\Leftrightarrow4x=\frac{8}{16}\)
\(\Leftrightarrow4x=\frac{1}{2}\)
\(\Leftrightarrow x=\frac{1}{2}:4\)
\(\Leftrightarrow x=\frac{1}{8}\)
Vậy x=\(\frac{1}{8}\)
\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=\frac{23}{16}\)
\(\Leftrightarrow\left(x+x+x+x\right)+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=\frac{23}{16}\)
\(\Leftrightarrow4x+\left(\frac{8+4+2+1}{16}\right)=\frac{23}{16}\)
\(\Leftrightarrow4x+\frac{15}{16}=\frac{23}{16}\)
\(\Leftrightarrow4x=\frac{23}{16}-\frac{15}{16}\)
\(\Leftrightarrow4x=\frac{1}{2}\)
\(\Leftrightarrow x=\frac{1}{2}:4\)
\(\Leftrightarrow x=\frac{1}{8}\)
\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=\frac{23}{16}\)
\(\Leftrightarrow4x+\frac{15}{16}=\frac{23}{16}\)(Phá các dấu ngoặc)
\(\Leftrightarrow4x=\frac{23}{16}-\frac{15}{16}\)
\(\Leftrightarrow4x=\frac{1}{2}\left(=\frac{8}{16}\right)\)
\(\Leftrightarrow x=\frac{1}{2}:4\Leftrightarrow x=\frac{1}{8}\)
(x + 1/2)+(x+1/4)+(x+1/8)+(x +1/16)=23/26
=(x+8/16)+(x+4/16)+(x+2/16)+(x+1/16)=23/16
=4 nhân x +(8/16 + 4/16 + 2/16 + 1/16)=23/16
4 nhân x =23/16-15/16
4 nhân x=8/16
x=8/16 :4=1/8
Vậy x = 1/8
Đặt A = 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256
2A = 2 (1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256)
= 1+1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128
=> A = 2A - A =1+1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 -1/2 - 1/4 - 1/8 - 1/16 - 1/32 - 1/64 - 1/128 - 1/256
= 1 - 1/256
= 255/256
b) 78.31 + 78.24 + 78.17 + 72. 22
= 78. ( 31 + 24 + 17 ) + 72 . 22
= 78 . 72 + 72 . 22
= 72 (78+22)
= 72 . 100 = 7200
b) 78 x 31 + 78 x 24 + 78 x 17 + 72 x 22
= 78 x ( 31 + 24 + 17 ) + 72 x 22
= 78 x 72 + 72 x 22
= 72 x ( 78 + 22 )
= 72 x 100
= 7200
lộn xộn quá cậu viết lại qua kí tự " gõ công thức toán đi"
Mk gõ lại cho
\(\left(\frac{173535}{88375}-\frac{161001}{1365}\right)x3\frac{6}{23}:\left(5-1\frac{187}{253}\right)\)
\(\dfrac{39}{368}\)
\(\dfrac{1}{16}+\dfrac{1}{23}=\dfrac{23}{368}+\dfrac{16}{368}=\dfrac{23+16}{368}=\dfrac{39}{368}\)