100 + 7 +8/100 =2514/25=100,56

35 + 5/10 +8/100=1779/50=35,58

100 + 7 + 8\100 = 2677\25 = 107.08

35 + 5\10 + 8\100 = 1779\50 = 35.58

a) 8,2

b) 36,23

c) 54,07

d) 12,254

TL :

a) 8,2

b) 36,23

c) 54,07

d) 12,254

Chúc bn hok tốt ~

7/10 = 0,7

7/100 = 0,07

 6   38/100 = 638/100 = 6,38

2014/1000 = 2,014

3/2 = 15/10 = 1,5

2/5 = 4/10 = 0,4

5/8 = 625/1000 = 0,625

1   1/4 = 5/4 = 125/100 =1,25

7/10=0,7

7/100=0,07

\(6\frac{38}{100}\)=319/50=6,38

2014/1000=2,014

3/2=1,5

2/5=0,4

5/8=0,625

\(1\frac{1}{4}\)=5/4=1,25

a=1+2-3+4-5+6-7+...+100

a=1+(2-3)+(4-5)+(6-7)+...+(98-99)+100

đặt b=(2-3)+(4-5)+(6-7)+...+(98-99)

b=-1+-1+-1+...+-1(49 số hạng -1)

=>b=-1x49=-49

=>a=1+-49+100

=>a=52

52

Bạn ơi cuối cùng là + 100 ak

Nếu + 100 thì giải thế này nha :

1/2.3 + 1/3.4 + .... + 1/98.99 + 100

= (3-2)/2.3+(4-3)/3.4+.....+(99-98)/98.99 +100

= 1/2 - 1/3 + 1/3 - 1/4 + ...... + 1/98 - 1/99 + 100

= 1/2 - 1/99 + 100 = 97/198 + 100 = 19897/198

\(1\frac{1}{3}:\left(1\frac{2}{3}-x\right)=\frac{8}{7}\)

\(\frac{4}{3}:\left(\frac{5}{3}-x\right)=\frac{8}{7}\)

\(\left(\frac{5}{3}-x\right)=\frac{4}{3}:\frac{8}{7}\)

\(\left(\frac{5}{3}-x\right)=\frac{7}{6}\)

\(x=\frac{5}{3}-\frac{7}{6}\)

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

Bài 2:

            theo thứ tự tăng dần:  \(\frac{75}{100};\)\(4\frac{1}{2};\)\(6,04;\)\(7.\)

\(1\frac{1}{3}:\left(1\frac{2}{3}-x\right)=\frac{8}{7}\Rightarrow\frac{4}{3}:\left(\frac{5}{3}-x\right)=\frac{8}{7}\)

\(\Rightarrow\frac{5}{3}-x=\frac{4}{3}:\frac{8}{7}\Rightarrow\frac{5}{3}-x=\frac{7}{6}\)

\(\Rightarrow x=\frac{5}{3}-\frac{7}{6}\Rightarrow x=\frac{1}{2}\)