Bài 2:
a: x+3/5=4/3
=>x=4/3-3/5=20/15-9/15=11/15
b: x-5/3-1/2=2/9
=>x-10/6-3/6=2/9
=>x-13/6=2/9
=>x=2/9+13/6=4/18+39/18=43/18
\(\dfrac{3}{8}+\dfrac{1}{4}=\dfrac{3+2}{8}=\dfrac{5}{8}.\\ 2+\dfrac{3}{4}=\dfrac{8+3}{4}=\dfrac{11}{4}.\)
\(\dfrac{5}{18}+\dfrac{8}{24}=\dfrac{20+24}{72}=\dfrac{44}{72}=\dfrac{11}{18}.\)
\(\dfrac{13}{19}+5=\dfrac{13+95}{19}=\dfrac{108}{19}.\)
\(\dfrac{25}{16}-\dfrac{7}{20}=\dfrac{125-28}{80}=\dfrac{97}{80}.\\ \dfrac{16}{24}-\dfrac{1}{6}=\dfrac{2}{3}-\dfrac{1}{6}=\dfrac{4-1}{6}=\dfrac{3}{6}=\dfrac{1}{2}.\)
\(\dfrac{25}{4}-3=\dfrac{25-12}{4}=\dfrac{13}{4}.\\ 7-\dfrac{5}{9}=\dfrac{63-5}{9}=\dfrac{58}{9}.\)
Bài 2:
a: x+3/5=4/3
=>x=4/3-3/5=20/15-9/15=11/15
b: x-5/3-1/2=2/9
=>x-10/6-3/6=2/9
=>x-13/6=2/9
=>x=2/9+13/6=4/18+39/18=43/18
