Question

Tính nhanh nếu có thể: (219-28)+(168-72-219)

Answer 1

\(\left(219-28\right)+\left(168-72-219\right)=219-28+168-72-219=\left(219-219\right)+\left(168-28\right)-72=0+140-72=68\)

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Answer 2

\(\left(219-28\right)+\left(168-72-219\right)=219-28+168-72-219=\left(219-219\right)+\left(168-28\right)-72=0+140-72=68\)

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Answer 3

(219-28)+(168-72-219)

= 191 + (-123)

= 68

Answer 4

\(\left(219-28\right)+\left(168-72-219\right)\\ =219-28+168-72-219\\ =\left(219-219\right)-28+168-72\\ =-28+168-72\\ =140-72\\ =68\)