问题
解答题
(1)-20+(-14)-(-18)+13
(2)-22+3×(-1)4-(-4)×5.
答案
(1)-20+(-14)-(-18)+13
=-20-14+18+13
=-34+31
=-3;
(2)-22+3×(-1)4-(-4)×5
=-4+3×1+20
=-4+3+20
=19.
(1)-20+(-14)-(-18)+13
(2)-22+3×(-1)4-(-4)×5.
(1)-20+(-14)-(-18)+13
=-20-14+18+13
=-34+31
=-3;
(2)-22+3×(-1)4-(-4)×5
=-4+3×1+20
=-4+3+20
=19.