问题
解答题
计算: (1)-2.4+3.5-4.6+3.5; (2)3.75-(+1.5)-(-4
(3)(-4
|
答案
(1)-2.4+3.5-4.6+3.5
=(-2.4-4.6)+(3.5+3.5)
=-7+7
=0;
(2)3.75-(+1.5)-(-4
)-(+81 4
)1 2
=3.75-1.5+4
-81 4 1 2
=(3.75+4
)+(-1.5-81 4
)1 2
=8+(-10)
=-2;
(3)(-4
)-{31 2
-[-0.13-(-0.33)]}2 5
=(-4
)-{31 2
+0.13-0.33}2 5
=-7.7.