题目内容

(1)56×( - (2)8470 - 104×65
(3)1.3 - 3.79+9.7 - 6.21 (4)3.64÷4+4.36×0.25
(5)(-)×4×9 (6)+++…+
(1)原式=56× - 56×
                =24 - 21
                =3
(2)原式=8470-6760
                =1710
(3)原式=1.3+9.7-(3.79+6.21)
                =11-10
                =1
(4)原式=3.64÷4+4.36÷4                
                =(3.64+4.36)÷4                
                =2
 (5)原式=×4×9-×4×9
                 =4 - 3
                 =1
  (6)原式=2×(1-)+2×(-)+2×(-)+…+2×(-
                  =2×(1-+-+-+…+-
                  =2×(1-
                  =
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