＋1＝10。

Addition and subtraction of integers Numbers up to ten thousand

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Worked solution

1. 根据加减法的互逆关系求出括号中的未知数

设未知数为 $x$ ，根据题意有：
$x + 1 = 10$
利用减法是加法的逆运算，可得：
$x = 10 - 1$
$x = 9$

Answer

9

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