问题
解答题
(1)(-7)+(-3)+|-5|; (2)3-(-1)+2×(-
(3)(-24)×(
(4)99.9×(-3)(用简便方法计算) |
答案
(1)原式=-7-3+5
=-10+5
=-5;
(2)原式=3+1-1
=3;
(3)原式=-24×
+24×1 12
-24×1 6 3 8
=-2+4-9
=2-9
=-7;
(4)原式=(100-0.1)×(-3)
=-300+0.3
=-299.7.