Question

[Hà Nguyễnn]

Đề bài:Tính hợp lí

Giúp mình với !!! Ai nhanh mình tick 

Answer 1

[Minh Hồng]

a) \(4,35-\left(2,67-1,65\right)+\left(3,54-6,33\right)\)

\(=4,35-2,67+1,65+3,54-6,33\\ =\left(4,35+1,65\right)-\left(2,67+6,33\right)+3,54\\ =6-9+3,54=3,54-3=0,54\)

b) \(\left(-0,5\right).\left(-0,5\right).\left(-0,8\right)\)

\(=\left(-\dfrac{1}{2}\right)\left(-\dfrac{1}{2}\right)\left(-\dfrac{4}{5}\right)\\ =-\left(\dfrac{1.1.4}{2.2.5}\right)=-\dfrac{1}{5}\)

c) \(3,58.24,45+3,58.75,55\)

\(=3,58\left(24,45+75,55\right)\\ =3,58.100=358\)

d) \(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right):\dfrac{7}{5}\)

\(=\dfrac{28}{15}.\dfrac{3}{4}-\left(\dfrac{11}{20}+\dfrac{1}{4}\right).\dfrac{5}{7}\\ =\dfrac{4.7.3}{3.5.4}-\dfrac{4}{5}.\dfrac{5}{7}\\ =\dfrac{7}{5}-\dfrac{4}{7}=\dfrac{29}{35}\)

e) \(\left(3,6-2\dfrac{2}{5}\right).\dfrac{-5}{3}+3\left(2\dfrac{1}{2}:50\%\right)\)

\(=\left(\dfrac{18}{5}-\dfrac{12}{5}\right).\dfrac{-5}{3}+3.\left(\dfrac{5}{2}:\dfrac{1}{2}\right)\\ =\dfrac{6}{5}.\dfrac{-5}{3}+3.5=-2+15=13\)