问题 解答题
计算:
(1)-2.4+3.5-4.6+3.5;
(2)3.75-(+1.5)-(-4
1
4
)-(+8
1
2
);
(3)(-4
1
2
)-{3
2
5
-[-0.13-(-0.33)]}.
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

1
4
)-(+8
1
2

=3.75-1.5+4

1
4
-8
1
2

=(3.75+4

1
4
)+(-1.5-8
1
2

=8+(-10)

=-2;

(3)(-4

1
2
)-{3
2
5
-[-0.13-(-0.33)]}

=(-4

1
2
)-{3
2
5
+0.13-0.33}

=-7.7.

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