\(\frac{1}{10}\)\(ha\)\(=\)\(1000\)\(m^2\)

1000 m2 nhé bn

\(2\frac{1}{5}\)\(ha\)=\(22000\)\(m^2\)

22000 mét vuông

Đủ ăn trong số ngày là:

90×12:120= 9 (ngày)

Đáp số:...

K mk nhé

\(A=\frac{3}{3.6}+\frac{3}{6.9}+\frac{3}{9.12}+...+\frac{3}{93.96}+\frac{3}{96.99}\)

\(A=1-\frac{1}{6}+\frac{1}{6}-\frac{1}{9}+\frac{1}{9}-\frac{1}{12}+...+\frac{1}{93}-\frac{1}{96}+\frac{1}{96}-\frac{1}{99}\)

\(A=1-\frac{1}{99}=\frac{98}{99}\)

Vậy A=\(\frac{98}{99}\)

\(B=\frac{1}{2.5}+\frac{1}{5.8}+\frac{1}{8.11}+...+\frac{1}{95.98}\)

\(3B=\)\(\frac{3}{2.5}+\frac{3}{5.8}+\frac{3}{8.11}+...+\frac{3}{95.98}\)

\(3B=\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{11}+...+\frac{1}{95}-\frac{1}{98}\)

\(3B=\frac{1}{2}-\frac{1}{98}=\frac{24}{49}\)

\(B=\frac{24}{49}:3=\frac{8}{49}\)

Vậy B=\(\frac{8}{49}\)

Dấu "." là dấu nhân.

_Học tốt_

88 000:5=17 600 dong

88 000:4=22 000dong

48 000:3=16 000 dong

48 000:2=24 000 dong

\(15\frac{3}{7}+24\frac{4}{9}+76\frac{4}{7}+85\frac{5}{9}\)

\(=(15\frac{3}{7}+76\frac{4}{7})+(24\frac{4}{9}+85\frac{5}{9})\)

\(= [(15+76)+(\frac{3}{7}+\frac{4}{7})]+[(24+85)+(\frac{4}{9}+\frac{5}{9})]\)

\(=(91+1)+(109+1)\)

\(=92+110=202\)

_Học tốt_

x/(1/2)+5/6=3/2

x/(1/2)=2/3

x=1/3

x : 1/2 + 5/6 = 3/2

x : 1/2         = 2/3

x                = 2/3 . 1/2

x                = 1/3

hok tốt