(-49-(+91)-(-5)+(-9)写过程阿

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(-49-(+91)-(-5)+(-9)写过程阿
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(-49-(+91)-(-5)+(-9)写过程阿
(-49-(+91)-(-5)+(-9)
写过程阿

(-49-(+91)-(-5)+(-9)写过程阿
(-49-(+91)-(-5)+(-9)
=-49-91+5-9
=-49+5-(91+9)
=-44-100
=-144

原式=-49-91+5-9=-154