Tính hợp lý a) -17/13 + (25/101 + 4/13) b) (-5/12 + 6/11) + (7/17
Giải thích
a)
−1713+25101+413=−1713+25101+413=−1713+413+25101=−1+25101=−76101
b)
−512+611+717+511+512=−512+611+717+511+512=−512+512+611+511+717=0+1+717=1717
a)
−1713+25101+413=−1713+25101+413=−1713+413+25101=−1+25101=−76101
b)
−512+611+717+511+512=−512+611+717+511+512=−512+512+611+511+717=0+1+717=1717