Q=5/30+15/90+25/150+35/210+45/270

  =5/30+5/30+5/30+5/210+5/30

  =5/30.5=25/30=5/6

k hieu

\(Q=\frac{5}{30}+\frac{5}{30}+\frac{5}{30}+\frac{5}{30}+\frac{5}{30}\)

\(=\frac{5}{30}.5\)

\(=\frac{5}{6}\)

5/30+15/90+25/150+35/210+45/270

=1/6+1/6+1/6+1/6+1/6

=1/30

 Q = 5 / 30 + 15 / 90 + 25 / 150 + 35 / 210 + 45 / 270

     =  1 / 6 + 1 / 6 + 1 / 6 + 1 / 6 + 1 / 6

      = 5 / 6

a) \(\frac{16.17-5}{16.16+11}=\frac{16.16+16-5}{16.16+11}=\frac{16.16+11}{16.16+11}=1\)1

b ) \(\frac{5}{30}+\frac{15}{90}+\frac{25}{150}+\frac{35}{210}+\frac{45}{270}=\frac{1}{6}+\frac{1}{6}+\frac{1}{6}+\frac{1}{6}+\frac{1}{6}\)

      \(=\frac{1}{6}.5=\frac{5}{6}\)

a)  (16x17-5)/(16x16+11)=(16x16-5+16)/(16x16+11)=1

b)  (1x5)/(6x5)+(3x5)/(18x5)+...+(9x5)/(54x5)

=1/6+1/6+1/6+1/6+1/6

=5/6

a) 4/9

b)5/6

k nha !!!

1,           53/51 + 1,75 + 61/8 + 41/4 + 3,875 - 3,4

              53/51 + 7/4 + 61/8 + 41/4 + 31/8 - 17/5

              53/51 + 7/4 + 61/8 + 31/8 + 41/4 - 17/5

              53/51 + 7/4 + 23/2 + 41/4 - 17/5

              53/51 + 7/4 + 41/4 + +23/2-17/5

              53/51 + 12 + 41/4 + 23/2

              =         7097/204

a)     5/30+15/90+25/150+35/210+45/270

       =1/6+1/6+1/6+1/6+1/6

       =1/6 x 5

       =5/6

b)     1/2+1/6+1/12+1/20+....+1/56

        =1/1x2+1/2x3+1/3x4+1/4x5+.....1/7x8

        =1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.......-1/7+1/7-1/8

        =1/1-1/8

         =7/8

c)     mình chịu

thank you bn nhìu nha

chịu,khó quá,nhất là câu c ý

\(25\frac{2}{13}-\left(\frac{15}{17}+15\frac{2}{3}\right)=\frac{327}{13}-\left(\frac{15}{17}+\frac{47}{3}\right)\)

\(=\frac{327}{13}-\frac{844}{51}\)

\(=\frac{5705}{663}\)

\(\frac{5}{30}+\frac{15}{90}+\frac{250}{150}+\frac{350}{210}+\frac{45}{270}=\frac{1}{6}+\frac{1}{6}+\frac{5}{3}+\frac{5}{3}+\frac{1}{6}\)

\(=\frac{3}{6}+\frac{10}{3}\)

\(=\frac{1}{2}+\frac{10}{3}\)

\(=\frac{23}{6}\)

\(3\frac{1}{11}.\frac{27}{46}.1\frac{6}{17}.2\frac{4}{9}=\frac{34}{11}.\frac{27}{46}.\frac{23}{17}.\frac{22}{9}\)

\(=\frac{68}{9}.\frac{27}{34}\)

\(=6\)

BẠN LẤY CÁI 5/30+45/270 NHA

NHỚ K NHA

\(\frac{1}{5}+\frac{4}{10}+...+\frac{81}{45}=\frac{1}{5}+\frac{2}{5}+\frac{3}{5}+...+\frac{9}{5}=\frac{1+2+3+...+9}{5}=\frac{45}{5}=9\)

1/5 + 4/10 + 9/15 + 16/20 + 25/25 + 36/30 + 49/35 + 64/40 + 81/45

=1/5 + 2/5 + 3/5 + 4/5 + 5/5 + 6/5 + 7/5 + 8/5 + 9/5

=45/5 = 9

a) \(\frac{2}{3}.\left(\frac{1}{3}+\frac{2}{5}\right)=\frac{2}{3}.\frac{11}{15}=\frac{22}{45}\)

b) 24+25+26+...+99+100

= (100+24).77:2

= 124.77:2

= 4774

c) \(\frac{16.17-5}{16.16+11}=\frac{16.16+(16-5)}{16.16+11}=\frac{16.16+11}{16.16+11}=1\)

d) \(\frac{5}{80}+\frac{5}{90}+\frac{5}{150}+\frac{5}{210}+\frac{5}{270}\)

\(=\frac{1}{16}+\frac{1}{18}+\frac{1}{30}+\frac{1}{42}+\frac{1}{54}\)

\(=\frac{2929}{15120}\)

a)=\(\frac{2}{3}.\left(\frac{5}{15}+\frac{6}{15}\right)\)

= \(\frac{2}{3}.\frac{11}{15}=\frac{22}{45}\)

d) = 5.(\(\frac{1}{80}+\frac{1}{90}+\frac{1}{150}+\frac{1}{210}+\frac{1}{270}\))

= 50........

kq là tự tính:)))))

b) =4774