a) \(\frac{2}{5}+\frac{3}{4}=\frac{2\cdot4+3\cdot5}{20}=\frac{8+15}{20}=\frac{23}{20}\)
b) \(\frac{5}{4}-\frac{1}{6}=\frac{5\cdot3-2}{12}=\frac{15-2}{12}=\frac{13}{12}\)
a, \(\frac{2}{5}+\frac{3}{4}=\frac{8}{20}+\frac{15}{20}=\frac{23}{20}\)
b,\(\frac{5}{4}-\frac{1}{6}=\frac{30}{24}-\frac{4}{24}=\frac{26}{24}=\frac{13}{12}\)
Sorry nha,câu 1 và 2 thì thêm mũ 2 vào hộ mink nhé
a)(2/5+3/4)=8/20+15/20=23/20
b)(5/4-1/6)=13/12
mink gửi lại câu hỏi rùi mấy bn giúp mink nha
a,(2/5+3/4)2=529/400
b)(5/4-1/6)2=169/144
\(a.\)
\(\left(\frac{2}{5}+\frac{3}{4}\right)\)
\(=\left(\frac{8}{20}+\frac{15}{20}\right)\)
\(=\frac{23}{20}\)
\(b.\)
\(\left(\frac{5}{4}-\frac{1}{6}\right)\)
\(=\left(\frac{30}{24}-\frac{4}{24}\right)\)
\(=\frac{26}{24}\)
\(=\frac{13}{12}\)