Tính giá trị biểu thức:B=0,36+72+9x0,28x4xm.Tìm giá trị của m để B=41,04
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23 tháng 1 2022
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1 tháng 7 2016
B = 1/6 + 1/12 + 1/20 + ... + 1/90
B = 1/2.3 + 1/3.4 + 1/4.5 + ... + 1/9.10
B = 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + ... + 1/9 - 1/10
B = 1/2 - 1/10
B = 5/10 - 1/10
B = 4/10 = 2/5
Ủng hộ mk nha ♡_♡☆_☆
25 tháng 2 2021
a) ĐKXĐ: \(x\notin\left\{1;-1\right\}\)
b) Ta có: \(B=\left(\dfrac{x-2}{2x-2}+\dfrac{3}{2x-2}-\dfrac{x+3}{2x+2}\right):\left(1-\dfrac{x-3}{x+1}\right)\)
\(=\left(\dfrac{x-1}{2x-2}-\dfrac{x+3}{2x+2}\right):\left(\dfrac{x+1-x-3}{x+1}\right)\)
\(=\left(\dfrac{\left(x-1\right)\left(x+1\right)}{2\left(x-1\right)\left(x+1\right)}-\dfrac{\left(x+3\right)\left(x-1\right)}{2\left(x-1\right)\left(x+1\right)}\right):\dfrac{-2}{x+1}\)
\(=\dfrac{x^2-1-x^2-2x+3}{2\left(x-1\right)\left(x+1\right)}\cdot\dfrac{x+1}{-2}\)
\(=\dfrac{-2x+2}{2\left(x-1\right)}\cdot\dfrac{-1}{2}\)
\(=\dfrac{-2\left(x-1\right)}{2\left(x-1\right)}\cdot\dfrac{-1}{2}\)
\(=\dfrac{1}{2}\)
Vậy: Khi x=2005 thì \(B=\dfrac{1}{2}\)
28 tháng 3 2018
Hình như là thế này
A,2.308+7,062
=9,370
2,308+9,91
=12,218
B,1,002+25,068+4,03
=(1,002+25,068)+4,03
=26,070 +4,03
=30,100
TN
18 tháng 4 2018
B=42-y/y-15=27-(y-15)/y-15=27/(y-15)-1
để B có giá trị nhỏ nhất =>27/y-15 - 1 có GTNN=>27/y-15 có GTNN
=>y-15=-1 => y=14
=> B có GTNN = -28 <=>y=14
LA
1
4 tháng 12 2021
\(\dfrac{2^{50}.6^{10}.9^9}{12}=\dfrac{2^{50}.3^{10}.2^{10}.3^{27}}{12}=\dfrac{2^{60}.3^{37}}{3.2^2}=2^{48}.3^{36}\)
1 tháng 7 2016
\(B=\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{90}\)
\(B=\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{9.10}\)
\(B=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{9}-\frac{1}{10}\)
\(B=\frac{1}{2}-\frac{1}{10}\)
\(B=\frac{2}{5}\)
B = 0,36 + 72 + 9 x 0,28 x 4 x m
9 x 0,25 x 4 x m = 41,04 - 0,36 - 72
= SAI ĐỀ NHA
~~ tk mk nha ~~
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m= -87/28