Question

[Tran Thai Han Thuyen]

giúp mình giải mấy bài này nhé:

a) \(\frac{298}{719}:\left(\frac{1}{4}+\frac{1}{12}-\frac{1}{3}\right)-\frac{2011}{2012}\)                                      b)\(\frac{27.18+27.103-120.27}{15.33+33.12}\)

2. rút gọn : B=\(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right)...\left(1-\frac{1}{20}\right)\)

Answer 1

[hellokitty]

\(\frac{27.\left(18+103-120\right)}{33.\left(15+12\right)}\)=\(\frac{27.1}{33.27}\)=\(\frac{1}{33}\)

mik dang ban moi giai duoc mot bai ha, sorry

Answer 2

[ho thi thao uyen]

k biet