14. Tính nhanh các phép tính sau (nếu có): a) (-24)+73+ (-19)+27+(-57)
b) 31. (-14) +17.(-14)-48.(-14)
c) (436) +998 +2 021 + (-1 564) + 1002
d) (-237) + (-117)- 183 +63
e) 16. (-9) + (-15):3-(-139)
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