( 17/10+7-8,7) : (23/4 -11/2+ 9/25)x(12,98x0,25)+12,5 

=0: (23/4 -11/2+ 9/25)x(12,98x0,25)+12,5 

=0+12,5 

=12,5 

tich dung cho minh nha

nhanh len rui mk tic dung cho

Bn bao nhiêu tuổi r ạ

30075cm³=30000 cm³ + 75 cm³=\(\dfrac{30000}{1000}\)cm³+75 cm³=30dm³+75cm³

a, 0,9% = \(\dfrac{9}{1000}\) 

Chọn C. \(\dfrac{9}{1000}\)

Tìm y: 

y: 0,25 + y : 12,5% - y : 0,5 =  25

y \(\times\) 4 + y \(\times\) 8 - y \(\times\) 2 = 25

y \(\times\) ( 4 + 8  - 2) = 25

y \(\times\) ( 12 - 2) = 25

y \(\times\) 10 = 25

y = 25 : 10

y = 2,5

(17/10 + 7 - 8,7) : (23/4 - 11/2 + 9/25) x (12,98 x 0,25) + 12,5 

= (1,7 + 7 - 8,7) : (23/4 - 11/2 + 9/25) x (12,98 x 0,25) + 12,5 

= (8,7 - 8,7) : (23/4 - 11/2 + 9/25) x (12,98 x 0,25) + 12,5 

= 0 : (23/4 - 11/2 + 9/25) x (12,98 x 0,25) + 12,5 

= 0 + 12,5 

= 12,5

\(\left(\frac{17}{10}+7-8,7\right):\left(\frac{23}{4}-\frac{11}{2}+\frac{9}{25}\right)\)\(\times\left(12,98\times0,25\right)+12,5\)

\(=0\div\left(\frac{23}{4}-\frac{11}{2}+\frac{9}{25}\right)\times\left(12,98\times0,25\right)+12,5\)

\(=0+12,5\)

\(=12,5\)

@ OreYinn

= 10+25+(-135)-(-100)

= (-100)-(-100)

= 0

12,5 * 2,5 + 12,5 * 7,5

= ??????????

Số đối của các số \(\frac{9}{{25}};\,\frac{{ - 8}}{{27}};\, - \frac{{15}}{{31}};\frac{5}{{ - 6}};\,3,9;\, - 12,5\) lần lượt là:

\( - \frac{9}{{25}};\,\frac{8}{{27}};\,\frac{{15}}{{31}};\frac{5}{6};\, - 3,9;\,12,5\).

12,5:25=0,5 nheeeeeeeeeeeeeeeeeeeeeeeeeee

12,5 : 25 = 0,5 = 50%

12,5 : 25 = 0,5 = 50%

a, 6/5

b, 3/28

c, 18,8

d, 1,46

1. 

a) \(\frac{13}{8}:\frac{13}{4}=\frac{1}{2}=0,5=50\%\)

b) \(12,5:2,5=5=500\%\)

~ Hok tốt ~

2.

\(\left(\frac{37}{9}+\frac{13}{4}\right).\frac{9}{4}+\frac{11}{4}\)

\(=\frac{265}{36}.\frac{9}{4}+\frac{11}{4}\)

\(=\frac{265}{16}+\frac{11}{4}\)

\(=\frac{309}{16}\)

\(1+\left(\frac{9}{10}-\frac{4}{5}\right):\frac{19}{6}\)

\(=1+\frac{1}{10}:\frac{19}{6}\)

\(=1+\frac{3}{95}\)

\(=\frac{98}{95}\)

\(\left(-7+\left|13\right|\right)-\left(13-\left|-7\right|-25\right)-\left(25+\left|-10\right|-9\right)\)

\(=\left(-7+13\right)-\left(13-7-25\right)-\left(25+10-9\right)\)

\(=-7+13-13+7+25-25-10+9\)

\(=\left(-7+7\right)+\left(13-13\right)+\left(25-25\right)-10+9\)

\(=0+0+0-10+9\)

\(=-10+9\)

\(=-1\)

~ Hok tốt ~

3.

\(2x+\frac{1}{4}=\frac{3}{2}\)

\(2x=\frac{3}{2}-\frac{1}{4}\)

\(2x=\frac{5}{4}\)

\(x=\frac{5}{4}:2\)

\(x=\frac{5}{8}\)

\(\left(x-5\right)-\frac{1}{3}=\frac{2}{5}\)

\(x-5=\frac{2}{5}+\frac{1}{3}\)

\(x-5=\frac{11}{15}\)

\(x=\frac{11}{15}+5\)

\(x=\frac{86}{15}\)

\(\left(4,5-2x\right):\frac{3}{4}=\frac{4}{3}\)

\(\left(\frac{9}{2}-2x\right):\frac{3}{4}=\frac{4}{3}\)

\(\frac{9}{2}-2x=\frac{4}{3}.\frac{3}{4}\)

\(\frac{9}{2}-2x=1\)

\(2x=\frac{9}{2}-1\)

\(2x=\frac{7}{2}\)

\(x=\frac{7}{2}:2\)

\(x=\frac{7}{4}\)

~ Hok tốt ~