Giải câu 1 trang 153 toán tiếng anh lớp 4

a) $\frac{3}{5}$+$\frac{11}{20}$= $\frac{12}{20}$+$\frac{11}{20}$=$\frac{12+11}{20}$=$\frac{23}{20}$

b) $\frac{5}{8}$-$\frac{4}{9}$= $\frac{45}{72}$-$\frac{32}{72}$=$\frac{45+32}{72}$=$\frac{13}{72}$

c) $\frac{9}{16}$x $\frac{4}{3}$= $\frac{9 \times4 }{16\times 3}$=$\frac{36}{48}$=$\frac{3}{4}$

d) $\frac{4}{7}$: $\frac{8}{11}$= $\frac{4\times 11}{7\times 8}$=$\frac{44}{56}$=$\frac{11}{14}$

e) $\frac{3}{5}$+$\frac{4}{5}$: $\frac{2}{5}$= $\frac{3}{5}$+$\frac{4\times 5}{5\times 2}$=$\frac{3}{5}$+$\frac{20}{10}$=$\frac{6}{10}$+$\frac{20}{10}$=$\frac{26}{10}$=$\frac{13}{5}$