问题 解答题
计算:
(1)(-38)+52+118+(-62);
(2)(-3
2
3
)-(-2
3
4
)-(-1
2
3
)-(+1.75)
答案

(1)(-38)+52+118+(-62)

=(-38-62)+(52+118)

=-100+170

=70;

(2)(-3

2
3
)-(-2
3
4
)-(-1
2
3
)-(+1.75)

=-3

2
3
+2
3
4
+1
2
3
-1.75

=(-3

2
3
+1
2
3
)+(2
3
4
-1
3
4

=-2+1

=-1.

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