Toán Lớp 6: a) ( 4/5 + 1/2 ) . ( 3/13 – 8/13 )
b) ( -1/2 ) mũ 3 . -4/3 – 2 : -6/5
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Toán Lớp 6: a) ( 4/5 + 1/2 ) . ( 3/13 – 8/13 )
b) ( -1/2 ) mũ 3 . -4/3 – 2 : -6/5
Comments ( 2 )
a) ($\frac{4}{5}$ + $\frac{1}{2}$) . ($\frac{3}{13}$ – $\frac{8}{13}$)
= ($\frac{8}{10}$ + $\frac{5}{10}$) . ($\frac{-5}{13}$)
= $\frac{13}{10}$ . ($\frac{-5}{13}$)
= $\frac{1}{2}$ . ($\frac{-1}{1}$)
= $\frac{-1}{2}$
b) ($\frac{-1}{2}$)³ . ($\frac{-4}{3}$) – 2 : $\frac{-6}{5}$
= $\frac{-1}{8}$ . ($\frac{-4}{3}$) – 2 . $\frac{-5}{6}$
= $\frac{4}{24}$ – ($\frac{-10}{6}$)
= $\frac{1}{6}$ – ($\frac{-10}{6}$)
= $\frac{1}{6}$ + $\frac{10}{6}$
= $\frac{11}{6}$
Giải đáp:
a , -1/2
b, 11/6
Lời giải và giải thích chi tiết:
a, (4/5 + 1/2). (3/13 – 8/13)
= (8/10 + 5/10) .(-5)/13
= 13/10 . (-5)/13
= -1/2
b, (-1/2)^3 . (-4)/3 – 2 : (-6)/5
= -1/8 . (-4)/3 – 2 . (-5)/6
= 1/6 – (-10)/6
= 11/6