a: \(\left(\frac{11}{4}-\frac78\right):\frac{11}{2}\)

\(=\left(\frac{22}{8}-\frac78\right)\times\frac{2}{11}\)

\(=\frac{15}{8}\times\frac{2}{11}=\frac{15}{4\times11}=\frac{15}{44}\)

b: Sửa đề: \(\frac{29}{44}:\frac{15}{44}\times\frac{15}{88}:\frac{165}{16}\)

\(=\frac{29}{44}\times\frac{44}{15}\times\frac{15}{88}\times\frac{16}{165}\)

\(=\frac{29}{88}\times\frac{16}{165}=29\times\frac{2}{11\times165}=\frac{58}{1815}\)

\(a.\left(\frac{6}{11}+\frac{5}{11}\right).\frac{3}{7}=1\cdot\frac{3}{7}=\frac{3}{7}b.\frac{3}{5}\cdot\frac{7}{9}+\frac{3}{5}\cdot\frac{2}{9}=\frac{3}{5}\cdot\left(\frac{7}{9}+\frac{2}{9}\right)=\frac{3}{5}\cdot1=\frac{3}{5}\)

\(\left(2.8x-32\right):\frac{2}{3}=90\)

\(2.8\cdot x-32=90\cdot\frac{2}{3}\)

\(\frac{14}{5}x-32=60\)

\(\frac{14}{5}x=60+32\)

\(\frac{14}{5}x=92\)

\(x=\frac{230}{7}\)

B , c , d tương tự

a)53/40 : 7/10 - 3/4 = tự tính nhé

b)34/35 : 17,5 = tự tính nhé

dễ thế mà ko làm được

híhis

\(6-\left(\frac76+\frac{7}{18}\right)\)

\(=6-\left(\frac{7\times3}{6\times3}+\frac{7}{18}\right)\)

\(=6-\left(\frac{21}{18}+\frac{7}{18}\right)\)

\(=6-\left(\frac{21+7}{18}\right)\)

\(=6-\frac{28}{18}\)

\(=6-\frac{28:2}{18:2}\)

\(=6-\frac{14}{9}\)

\(=\frac{6\times9}{1\times9}-\frac{14}{9}\)

\(=\frac{36}{9}-\frac{14}{9}\)

\(=\frac{54-14}{9}\)

\(=\frac{40}{9}\)

cong hai cái số trong ngoac rồi lấy 6 đổi ra 6'1 trừ đi

3+2/5=3/1+2/5=17/5

4-5/7=4/1-5/7=23/7

2/5+1/3=11/15=1=15/15-11/15=4/15

tick nha