Câu hỏi của almira tam

Question

Tính giá trị biểu thức:

a)1/5-(-1/3)

b)-1/2x4/9+3/7:5/14

shi nit chi · Accepted Answer

a) $\frac{1}{5}-\left(-\frac{1}{3}\right)=\frac{1}{5}+\frac{1}{3}=\frac{3}{15}+\frac{5}{15}=\frac{8}{15}$

b) $-\frac{1}{2}\cdot\frac{4}{9}+\frac{3}{7}:\frac{5}{14}$

$=-\frac{2}{9}+\frac{6}{5}$

$=\frac{44}{45}$

Câu trả lời:

a) $\frac{1}{5}-\left(-\frac{1}{3}\right)=\frac{1}{5}+\frac{1}{3}=\frac{3}{15}+\frac{5}{15}=\frac{8}{15}$

b) $-\frac{1}{2}\cdot\frac{4}{9}+\frac{3}{7}:\frac{5}{14}$

$=-\frac{2}{9}+\frac{6}{5}$

$=\frac{44}{45}$