问题
解答题
耐心算一算 (1)(-3)+(-4)-(+11)-(-19); (2)-3.5÷
(3)(
(4)-12-(1-0.5)×
|
答案
(1)原式=-3-4-11+19
=-18+19
=1;
(2)原式=
×7 2
×8 7
×8 7 3 64
=
;3 14
(3)原式=-
×48+3 8
×48-2 3
×481 2
=-18+32-24
=-42+32
=-10;
(4)原式=-1-
×1 2
×[2-9].1 3
=-1+-
×1 2
×[-7].1 3
=-1+7 6
=
.1 6