: Rút gọn các phân số sau: a) −22/ 36 b) −51 /34 c) 132/ −144 d) −126/ 270 e) 1.2.3+2.4.6+3.6.9+5.10.15/ 1.3.6+2.6.12+3.9.18+5.15.30 f) 3469−54/ 6938−108 g) 2468−98/...
Đọc tiếp
: Rút gọn các phân số sau: a) −22/ 36 b) −51 /34 c) 132/ −144 d) −126/ 270 e) 1.2.3+2.4.6+3.6.9+5.10.15/ 1.3.6+2.6.12+3.9.18+5.15.30 f) 3469−54/ 6938−108 g) 2468−98/ 3702−147
\(\dfrac{-22}{36}=-\dfrac{11}{18}\)
\(\dfrac{-51}{34}=-\dfrac{3}{2}\)
\(\dfrac{132}{-144}=-\dfrac{11}{12}\)
\(\dfrac{-126}{270}=-\dfrac{7}{15}\)
\(\dfrac{1.2.3+2.4.6+3.6.9+5.10.15}{1.3.6+2.6.12+3.9.18+5.15.30}=\dfrac{1.2.3\left(1+2^3+3^3+5^3\right)}{1.3.6\left(1+2^3+3^3+5^3\right)}=\dfrac{1}{3}\)
\(\dfrac{3469-54}{6938-108}=\dfrac{3469-54}{2.\left(3469-54\right)}=\dfrac{1}{2}\)
\(\dfrac{2468-98}{3702-147}=\dfrac{2.\left(1234-49\right)}{3.\left(1234-49\right)}=\dfrac{2}{3}\)