Câu hỏi của Nguyễn Mai Dung

Question

Bài 1 (2điểm): Tính.

a) 5/9 + 8/9 =................................................. b) 4/3 - 4/8 =.................

⚚ßé Só¡⁀ᶦᵈᵒᶫ · Accepted Answer

a)$\frac{5}{9}+\frac{8}{9}=\frac{5+8}{9}=\frac{13}{9}$

b)$\frac{4}{3}-\frac{4}{8}=\frac{32}{24}-\frac{12}{24}=\frac{32-12}{24}=\frac{20}{24}=\frac{5}{6}$

c)$\frac{14}{9}\times\frac{2}{3}=\frac{14\times2}{9\times3}=\frac{28}{27}$

$\frac{14}{15}:\frac{5}{6}=\frac{14}{15}\times\frac{6}{5}=\frac{14\times6}{15\times5}=\frac{84}{75}=\frac{28}{25}$

Câu trả lời:

a)$\frac{5}{9}+\frac{8}{9}=\frac{5+8}{9}=\frac{13}{9}$

b)$\frac{4}{3}-\frac{4}{8}=\frac{32}{24}-\frac{12}{24}=\frac{32-12}{24}=\frac{20}{24}=\frac{5}{6}$

c)$\frac{14}{9}\times\frac{2}{3}=\frac{14\times2}{9\times3}=\frac{28}{27}$

$\frac{14}{15}:\frac{5}{6}=\frac{14}{15}\times\frac{6}{5}=\frac{14\times6}{15\times5}=\frac{84}{75}=\frac{28}{25}$