A = [ -3/4 ] + [ -1/5 ] + [ -2/3 ]
= [ -45/60 ] + [ -12/60 ] + [ -40/60 ]
= - [ 45 + 12 + 40 / 60 ]
= -97/60
Đúng 3
Bình luận (2)
\(A=\left(-\dfrac{3}{4}\right)+\left(-\dfrac{1}{5}\right)+\left(-\dfrac{2}{3}\right)\)
\(=-\left(\dfrac{3}{4}+\dfrac{1}{5}+\dfrac{2}{3}\right)\)
\(=-\left(\dfrac{45}{60}+\dfrac{12}{60}+\dfrac{40}{60}\right)\)
\(=-\left(\dfrac{45+12+40}{60}\right)\)
\(=-\dfrac{97}{60}\)
Đúng 4
Bình luận (0)
