题目内容

(1)125 - 25×6÷30 (2)(+)×45
(3)1.8+4.3+0.7+4.2 (4)8.3×9.9+8.3×0.1
(5)(2.67+2.67×2+2.67)×25 (6)+0.45÷0.9 -
(1)原式= 125 - 150+30     
                = 125 - 5               
                = 120   
(2)原式=×45+×45
                =30+6
                =36
(3)原式=(1.8 + 4.2)+(4.3 + 0.7)
                =6+5
                =11
(4)原式= 8.3×(9.9 + 0.1)
                = 8.3× 10
                = 83
(5)原式= 2.67×4×25
                = 2.67× 100
                = 267
(6)原式=+ -
                =1 - =
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