Question

[phạm thị hà phương]

\(a,\frac{7\cdot9-14}{3-17}\)                            \(b,0,25.2\frac{1}{3}.30.0,5.\frac{8}{45}\)

\(c,\frac{9}{23}.\frac{5}{8}+\frac{9}{23}.\frac{3}{8}-\frac{9}{23}\)      \(d,(4\frac{1}{9}+3\frac{1}{4}).2\frac{1}{4}+2\frac{3}{4}\)           

\(e,(-0,75+\frac{1}{2}):\frac{4}{3}\)              \(f,\frac{5}{9}.\frac{2}{7}+\frac{5}{9}.\frac{5}{7}-\frac{8}{3}\)   

\(g,7,5.1\frac{3}{4}-6\frac{2}{5}\)                     \(h,1\frac{13}{15}.0,75-(\frac{8}{15}+25\%)\)  

Answer 1

[♫❥๖ۣۜ Nhớღ........ღNhiềuღLắm๖ۣۜ ❥♫]

415+44_1441341

Answer 2

[Huỳnh Quang Sang]

Mình làm câu a,c, thôi , còn bạn làm nốt bài b,d, nhé

\(a,\frac{7\cdot9-14}{3-17}=\frac{63-14}{3-17}=\frac{49}{-14}=\frac{7\cdot7}{(-2)\cdot7}=\frac{7}{-2}=\frac{-7}{2}\)

\(c,\frac{9}{23}\cdot\frac{5}{8}+\frac{9}{23}\cdot\frac{3}{8}-\frac{9}{23}\)

\(=\frac{9}{23}\cdot\left[\frac{5}{8}+\frac{3}{8}-1\right]\)

\(=\frac{9}{23}\cdot\left[1-1\right]=\frac{9}{23}\cdot0=0\)