Question

Tính

a. 15 / 9 :3/4 :7/5

b. 23/7 x25/2 -23 /7 x ( 5 +1/2 ) 

 

Answer 1

a) \(\frac{15}{9}:\frac{3}{4}:\frac{7}{5}=\frac{15}{9}.\frac{4}{3}.\frac{5}{7}=\frac{300}{189}=\frac{100}{63}\)

b ) \(\frac{23}{7}.\frac{25}{2}-\frac{23}{7}.\left(5+\frac{1}{2}\right)=\frac{23}{7}.\left(\frac{25}{2}-\frac{11}{2}\right)=\frac{23}{7}.7=23\)

Answer 2

a)\(\frac{100}{63}\)

b)   23

Answer 3

a)\(\frac{15}{9}x\frac{4}{3}x\frac{5}{7}=\frac{15x4x5}{9x3x7}=\frac{100}{63}\)

b)23

Answer 4

bạn trình bày cách làm cho mình nhé !

Answer 5

cảm ơn các bạn nhé !