\(\frac{4}{13}+\frac{9}{5}=\frac{137}{65}\)

\(3-\frac{2}{16}=\frac{23}{8}\)

\(\frac{12}{31}\times\frac{1}{19}=\frac{12}{589}\)

\(\frac{3}{8}\div\frac{9}{12}=\frac{1}{2}\)

\(\text{Trả lời :}\)

\(\frac{4}{13}+\frac{9}{5}=\frac{137}{65}\)

\(3-\frac{2}{16}=\frac{23}{8}\)

\(\frac{12}{31}\times\frac{1}{19}=\frac{12}{589}\)

\(\frac{3}{8}\div\frac{9}{12}=\frac{1}{2}\)

\(\text{~~Học tốt~~}\)

\(a,\frac{5}{6}+x\)x \(\frac{3}{4}=3\)

\(x\)x \(\frac{3}{4}=3-\frac{5}{6}\)

\(x\)x \(\frac{3}{4}=\frac{13}{6}\)

\(x=\frac{13}{6}:\frac{3}{4}\)

\(x=\frac{26}{9}\)

b, \(5\frac{1}{6}-x:\frac{3}{4}=\frac{2}{3}\)

\(\frac{31}{6}-x:\frac{3}{4}=\frac{2}{3}\)

\(x:\frac{3}{4}=\frac{31}{6}-\frac{2}{3}\)

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

\(x=\frac{9}{2}\)x \(\frac{3}{4}\)

\(x=\frac{27}{8}\)

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

a)\(\dfrac{5}{7}+\dfrac{4}{9}=\dfrac{45}{63}+\dfrac{28}{63}=\dfrac{73}{63}\) ; \(\dfrac{9}{11}+\dfrac{3}{8}=\dfrac{72}{88}+\dfrac{33}{88}=\dfrac{105}{88}\)

\(\dfrac{4}{5}-\dfrac{2}{3}=\dfrac{12}{15}-\dfrac{10}{15}=\dfrac{2}{15}\); \(\dfrac{16}{25}-\dfrac{2}{5}=\dfrac{16}{25}-\dfrac{10}{25}=\dfrac{6}{25}\)

b)\(5+\dfrac{3}{5}=\dfrac{25}{5}+\dfrac{3}{5}=\dfrac{28}{5};10-\dfrac{9}{16}=\dfrac{160}{16}-\dfrac{9}{16}=\dfrac{151}{16}\)

\(\dfrac{2}{3}-\left(\dfrac{1}{6}+\dfrac{1}{8}\right)=\dfrac{2}{3}-\left(\dfrac{8}{48}+\dfrac{6}{48}\right)=\dfrac{2}{3}-\dfrac{14}{48}=\dfrac{32}{48}-\dfrac{14}{48}=\dfrac{3}{8}\)

2x122+3x112+3x116=928 ( cm)

Nhớ k

 trung bình chiều cao 2 bạn đầu là(112+112):2=..(cm)

 trung bình chiều cao 3 bạn sau là: (112+112+112):3=....(cm)

trung bình chiều cao 3 bạn còn lại là :(116+116+116):3=...(cm)

trung bình chiều cao các bạn tổ 1 là:..(lấy 3 kết quả phép tinh trên cộng lại)

phân số nào

phân số nào ?

a Đ

b S

c S

d Đ

a ) S 

b ) Đ

c ) S

d ) Đ

k cho mk nhé