mk tr cho vui

=15+37+52-37-17 =(37-37)+52+15-17 =0+52+15-17 =67-17 =50

(38 – 42 + 14) – (25 – 27 – 15) =38-42+14-25+27+15 =27 c. -(21 – 32) – (-12 + 32) =-21+32+12-32 =-9 d. -(12 + 21 – 23) - (23 – 21 + 10) =-12-21+23-23+21-10 =-22 e. (57 – 725) – (605 – 53) =57-725-605+53 =-1220 f. (55 + 45 + 15) – (15 – 55 + 45) =55+45+15-15+55-45 =110

-6480

x ⋮ 18; x ⋮ 48

=> x thuộc BC(18; 48)         (1)

18 = 2.32

48 = 24.3

BCNN(18; 48) = 24.32 = 144

BC(18; 48) = B(144) = {0; 144; 288; ...} mà 100 < x < 200

=> x = 144

They visit their relatives and friends so that they can exchange New Year's wishes

Tet is a time of fun and festivals throughout the country

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