34-(26-12)=?

34-(26-12)
= 34-26+12
= 20

or

34-(26-12)
= 34-14
= 20

可以試下自己做~

式:
34-(26-12)
=34-14
=20//

或用正負數:
34-(26-12)
=34-26+12
=8+12
=20//





式:
35-(23-19)
=35-4
=31//

或用正負數:
35-(23-19)
=35-23+19
=12+19
=31//

最基本
34-(26-12)
=34-14 先計括號內
=20

or

另一計算方法(較困難)
34-(26-12)
=34-26+12 可先拆括號,然後把括號外的符號約,例:正負得負,負負得正
=20 答案同樣等於20

34-(26-12)=20

先計(26-12)~ =14
後計34-(14)~ =20


ps: ( )的數要先計~

34-(26-12)

=34-14

=20
==

34-(26-12)
=34-14
=20

34-(26-12)=20

34-(26-12)
=34-14
=20

34-(26-12)
=34-14
=20

34-(26-12)=20

2007-02-03 11:20:09 補充：
35-(23-19)=31()

20

I hope I can help you