Toán Lớp 6: 1/2.(-3)/4.(-5)/8.(-8)/9 6/5+1/6:(-3) 7/8:5/4.(-10)/7

Question

Toán Lớp 6:  1/2.(-3)/4.(-5)/8.(-8)/9 6/5+1/6:(-3) 7/8:5/4.(-10)/7

buithaianh98 · Answer

Giải đáp:   a) $ frac{1}{2}$ . ($ frac{-3}{4}$) .($ frac{-5}{8}$ ).($ frac{-8}{9}$) = $ frac{-3}{8}$ . $ frac{5}{9}$ = $ frac{-5}{24}$   b) $ frac{6}{5}$ + $ frac{1}{6}$ : (-3) = $ frac{6}{5}$ - $ frac{1}{18}$ = $ frac{103}{90}$   c) $ frac{7}{8}$ : $ frac{5}{4}$ . ($ frac{-10}{7}$ )= $ frac{7}{10}$ .($ frac{-10}{7}$ ) = -1

truongthanhhung · Answer

1/2 . ( - 3 )/4 . ( - 5 )/8 . ( - 8  )/9   = ( 1/2 . ( - 3 )/4 ) . ( ( - 5 )/8 . ( - 8 )/9 )   = ( - 3 )/8 . 5/9   = ( - 5 )/24     ____________________________________________   6/5 + 1/6 : ( - 3 )   = 6/5 + 1/6 . ( - 1 )/3   = 6/5 + ( - 1 )/18   = 108/90 + ( - 5 )/90   = 103/90   ____________________________________________   7/8 : 5/4 . ( - 10 )/7   = 7/8 . 4/5 . ( - 10 )/7   = ( 7 . 4 . ( - 10 ) )/( 8 . 5 . 7 )   = ( 7 . 4 . ( - 2 ) . 5 )/( 2 . 4 . 5 . 7 )   = - 1