(5-6)-(7-9)计算过程

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(5-6)-(7-9)计算过程
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(5-6)-(7-9)计算过程
(5-6)-(7-9)计算过程

(5-6)-(7-9)计算过程

5-6-7+9=1

(5-6)-(7-9)
=[-(6-5)]-[-(9-7)]
=(-1)-(-2)
=(-1)+2
=2-1
=1

(-1)-(-2)

(5-6)-(7-9)
=(-1)-(-2)
=1

5-6-7+9

-1 - -2=-1+2=1

-1-(7-9)=-1-7+9=1

-3

1

(5-6)-(7-9)
=-1-(-2)
=-1+2
=1

-1-(-2)=-1+2=1

(5-6)-(7-9)
=(-1)-(-2)
=(-1)+2
=2-1
=1