问题 填空题
计算(-0.25)-(-3
1
4
)+2.75-(+7
1
2
)=______.
答案

(-0.25)-(-3

1
4
)+2.75-(+7
1
2

=-0.25+3

1
4
+2.75-7
1
2

=3+2.75-7

1
2

=5.75-7

1
2

=-1.75.

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