A)3/4=3×5/4×5=15/20
2/5=2×4/5×4=8/20
B)5/12=5×3/12×3=15/36
11/36 (giữ nguyên)
C)2/3=2×20/3×20=40/60
3/4=3×15/4×15=45/60
4/5=4×12/5×12=48/60
3/4=15/20
2/5=8/20
5/12=15/36
11/36=11/36
2/3=40/60
3/4=45/60
4/5=48/60
3/4 và 2/5 3/4=\(\frac{3\cdot5}{4\cdot5}=\frac{15}{20}\)2/5=\(\frac{2\cdot4}{5\cdot4}=\frac{8}{20}\)
5/12 và 11/36 5/12=\(\frac{5\cdot3}{12\cdot3}=\frac{15}{36}\); 11/36=\(\frac{11\cdot1}{36\cdot1}=\frac{11}{36}\)
2/3;3/4 và 4/5 2/3=\(\frac{2\cdot20}{3\cdot20}=\frac{40}{60}\); 3/4=\(\frac{3\cdot15}{4\cdot15}=\frac{45}{60}\); 4/5=\(\frac{4\cdot12}{5\cdot12}=\frac{48}{60}\)
Chúc bạn học tốt!
a)\(\frac{3}{4}\)và \(\frac{2}{5}\)MC=20
\(\frac{3}{4}\)=\(\frac{3x5}{4x5}\)=\(\frac{15}{20}\)
\(\frac{2}{5}\)=\(\frac{2x4}{5x4}\)=\(\frac{8}{20}\)
b)\(\frac{5}{12}\)và \(\frac{11}{36}\)MC=36
\(\frac{5}{12}\)=\(\frac{5x3}{12x3}\)=\(\frac{15}{36}\)và \(\frac{11}{36}\)
c)\(\frac{2}{3}\), \(\frac{3}{4}\)và \(\frac{4}{5}\)MC=60
\(\frac{2}{3}\)= \(\frac{2x20}{3x20}\)\(\frac{40}{60}\)
\(\frac{3}{4}\)=\(\frac{3x15}{4x15}\)= \(\frac{45}{60}\)
\(\frac{4}{5}\)=\(\frac{4x12}{5x12}\)= \(\frac{48}{60}\)
CHÚC BẠN HỌC GIỎI NHA
