\(2m^313dm^3=2,013m^3\)

\(1m^320dm^3=1,02m^3\)

\(4m^35dm^3=4,005m^3\)

\(3m^317cm^3=3,000017m^3\)

2m³ 13dm³ = 3,3m³

1m³ 20dm³ = 3m³

4m³5dm³ = 4,5m³

3m³17cm³ = 3,17m³

28/15

6

a = 28/15

b = 90/15

\(\left(2746-x\right)-258=1360\)

\(2746-x=1360+258\)

\(2746-x=1618\)

\(x=2746-1618\Rightarrow x=1128\)

\(a.\)\(1\frac{2}{3}:\frac{2}{3}-\frac{3}{4}\cdot\frac{2}{3}+5\frac{3}{7}\)

\(=\frac{5}{3}:\frac{2}{3}-\frac{3}{4}\cdot\frac{2}{3}+\frac{38}{7}\)

\(=\frac{5}{3}\cdot\frac{3}{2}-\frac{3}{4}\cdot\frac{2}{3}+\frac{38}{7}\)

\(=\frac{5}{2}-\frac{1}{2}+\frac{38}{7}\)

\(=\frac{4}{2}+\frac{38}{7}\)

\(=2+\frac{38}{7}\)

\(=\frac{14}{7}+\frac{38}{7}\)

\(=\frac{52}{7}\)

\(b.1\frac{1}{3}-1\frac{1}{4}:1\frac{1}{2}+2\frac{3}{4}\cdot3\frac{2}{3}\)

\(=\frac{4}{3}-\frac{5}{4}:\frac{3}{2}+\frac{11}{4}\cdot\frac{11}{3}\)

\(=\frac{4}{3}-\frac{5}{4}\cdot\frac{2}{3}+\frac{11}{4}\cdot\frac{11}{3}\)

\(=\frac{4}{3}-\frac{5}{6}+\frac{121}{12}\)

\(=\frac{16}{12}-\frac{10}{12}+\frac{121}{12}\)

\(=\frac{6}{12}+\frac{121}{12}\)

\(=\frac{127}{12}\)

\(c.7\cdot\frac{2}{3}-\frac{2}{5}:\frac{1}{2}-\frac{2}{3}\)

\(=7\cdot\frac{2}{3}-\frac{2}{5}\cdot\frac{2}{1}-\frac{2}{3}\)

\(=7\cdot\frac{2}{3}-\frac{4}{5}-\frac{2}{3}\)

\(=\frac{14}{3}-\frac{4}{5}-\frac{2}{3}\)

\(=\frac{70}{15}-\frac{12}{15}-\frac{10}{15}\)

\(=\frac{58}{15}-\frac{10}{15}\)

\(=\frac{48}{15}=\frac{16}{5}\)

\(\frac{5}{3}:\frac{2}{3}-\frac{3}{4}\cdot\frac{2}{3}+\frac{38}{7}\)

\(\frac{5}{2}-\frac{1}{2}+\frac{38}{7}\)

\(2+\frac{38}{7}\)

\(\frac{52}{7}\)

trả lời 

đúng 

vì x là 1

chúc bn học tốt

\(2\frac{3}{4}< 2.\frac{3}{4}\left(s\right)\)

\(2\frac{3}{4}=2\cdot\frac{3}{4}\left(s\right)\)

\(2\frac{3}{4}>2.\frac{3}{4}\left(\text{đ}\right)\)

= 2/21

=9/5

=37/6:\(6\frac{1}{6}\)

=79/20: tự đổi nhe bạn

=3/5__________-

\(\frac{4}{15}x\frac{5}{14}=\frac{4x5}{15x14}=\frac{2x1}{3x7}=\frac{2}{21}\)

\(\frac{3}{4}:\frac{5}{12}=\frac{3}{4}x\frac{12}{5}=\frac{3x12}{4x5}=\frac{3x3}{1x5}=\frac{9}{5}=1,8\)

\(\frac{7}{2}+\frac{8}{3}=\frac{7x3}{2x3}+\frac{8x2}{3x2}=\frac{21}{6}+\frac{16}{6}=\frac{21+16}{6}=\frac{37}{6}\)

A)\(\frac{4}{3}\times\frac{9}{5}-\frac{6}{5}+3\)

\(=\frac{12}{5}-\frac{6}{5}+3\)

\(=\frac{6}{5}+3\)

\(=3\frac{6}{5}\)

B) \(\frac{5}{3}\div4\div\frac{3}{7}\)

\(=\frac{5}{12}\div\frac{3}{7}\)

\(=\frac{35}{36}\)

C) \(1\frac{3}{4}\div2\frac{3}{5}\)

\(=\frac{7}{4}\div\frac{13}{5}\)

\(=\frac{35}{52}\)

CHÚC BẠN HỌC TỐT!!

\(\frac{4}{3}.\frac{9}{5}-\frac{6}{5}+3=\frac{21}{5}\)

\(\frac{5}{3}:4:\frac{3}{7}=\frac{35}{36}\)

\(1\frac{3}{4}:2\frac{3}{5}=\frac{35}{52}\)

đưa hết hỗn số về dạng phân số rồi quy đồng bình thường ạ !

Hoàng_Linh_Nga làm đc thì làm nhé.

Giải:

\(2\frac{1}{6}+3\frac{2}{3}\)

\(=\frac{13}{12}+\frac{11}{9}\)

\(=\frac{249}{108}\)

\(4\frac{3}{4}-3\frac{5}{6}\)

\(=\frac{19}{16}-\frac{23}{18}\)

\(=\frac{342}{288}-\frac{368}{288}\)

\(=\frac{-26}{288}\)xem lại đề đi nhé

\(9\frac{1}{6}\times4\frac{2}{3}\)

\(=\frac{55}{18}\times\frac{15}{12}\)

\(=\frac{825}{216}\)

\(2\frac{5}{7}:\frac{14}{5}\)

\(=\frac{19}{7}:\frac{14}{5}\)

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

Câu 1\(\frac{9}{8}.\frac{9}{3}=\frac{81}{24}\)

Câu 2 \(\frac{19}{5}+\frac{9}{5}=\frac{28}{5}\)

Câu 3 \(\frac{31}{7}:\frac{22}{5}=\frac{31.5}{7.22}=\frac{155}{154}\)

Câu 4 \(\frac{12}{1}-\frac{31}{5}=\frac{60}{5}-\frac{31}{5}=\frac{29}{5}\)

ai k mình mình k lại