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hailinh1976
2 năm trước
Bài 1 . Tính tổng các số nguyên x biết 1/ -20<x<21 2/-18<_x<_17 3/ -27<x<_ 27 4/ 27:(3x-2)=-3 5/ -45:5.(-3-2x)=3 Bài2 Tính tổng 1/ 1+(-2)-3+(-4)+...+19+(-20) 2/ 1-2+3-4+...+99-100 3/ 2-4+6-8+...+48-50 4/ -1+3-5+7-...+97-99 5/ 1+2-3-4+...+97+98-99-100
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