32,5x7,3+32,5x2,7-125

=32,5x(7,3+2,7)-125

=32,5x10-125

=325-125

=200 k mk~mk k lại!!!!

1904137199

1+ 1 + 5 + 6 + 9 + 9 + 2 + 3 + 84 + 952068544 = 952068664 nha bn

mik cs fb nè

mà bn k mấy ạ?

MK K11

kb fb nhé

\(4x-\left(x+\frac{1}{2}\right)=2x-\left(\frac{1}{2}x-5\right)\)

\(\Leftrightarrow4x-x-\frac{1}{2}=2x-\frac{1}{2}x+5\)

\(\Leftrightarrow4x-x-2x+\frac{1}{2}x=5-\frac{1}{2}\)

\(\Leftrightarrow\frac{3}{2}x=\frac{9}{2}\Leftrightarrow x=3\)

1 + 5 = 6

2 + 3 = 5 

2 x 2 - 3 = 1

1 + 5 - 6 = 0

1+5=6

2+3=5

2*2-3=4-3=1

1+5-6=6-6=0

6

5

1

0

nha

mik

\(3^2x2^5x\left(\frac{2}{3}\right)^3\)

\(=\frac{256}{3}\)

đúng nhé

tk nữa

\(3^2.2^5.\left(\frac{2}{3}\right)^3\)

\(=9.32.\frac{8}{27}\)

\(=\frac{256}{3}\)

3² x 2⁵ x ( 2/3 ) ³

= 256/3

Số An nghĩ là : 5/6*4/5:3/4:1/2=16/9

Tôi nhầm ở đó và đáp án và cách là : 5/6*4/5:3/4-1/2=7/18. 

\(E=\frac{5}{2\cdot4}+\frac{5}{4\cdot6}+...+\frac{5}{98\cdot100}\)

\(2E=\frac{5}{2}-\frac{5}{4}+\frac{5}{4}-\frac{5}{6}+...+\frac{5}{98}-\frac{5}{100}\)

\(2E=\frac{5}{2}-\frac{1}{20}\)

\(2E=\frac{49}{20}\)

\(E=\frac{49}{20}\cdot\frac{1}{2}=\frac{49}{40}\)

Đặt  \(E=\frac{5}{2.4}+\frac{5}{4.6}+...+\frac{5}{98.100}\)

\(=1-\left(\frac{5}{2}-\frac{5}{4}\right)+\left(\frac{5}{4}-\frac{5}{6}\right)+...+\left(\frac{5}{98}-\frac{5}{100}\right)\)

\(=1-\frac{5}{100}\)

\(=\frac{95}{100}\)

\(E=\frac{5}{2.4}+\frac{5}{4.6}+...+\frac{5}{98.100}\)

\(\Leftrightarrow E=\frac{5}{2}\left(\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{6}+...+\frac{1}{98}-\frac{1}{100}\right)\)

\(\Leftrightarrow E=\frac{5}{2}\left(\frac{1}{2}-\frac{1}{100}\right)\)

\(\Leftrightarrow E=\frac{5}{2}\cdot\frac{49}{100}\)

\(\Leftrightarrow E=\frac{49}{40}\)