(+12)-(+18)-(+23)+(+51)等于多少,

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(+12)-(+18)-(+23)+(+51)等于多少,
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(+12)-(+18)-(+23)+(+51)等于多少,
(+12)-(+18)-(+23)+(+51)等于多少,

(+12)-(+18)-(+23)+(+51)等于多少,
=12-18-23+51
=(12+51)-(18+23)
=63-41
=22

=12-18-23+51
=63-23-18
=40-18
=22

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(+12)-(+18)-(+23)+(+51)
=12-18-23+51
=22