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50%x-30=52                                      
4.5x+3.8x=16.6
1
4
:x=
1
2
1
6
                                       
x
45
=20%
人气:234 ℃ 时间:2020-03-28 08:28:35
解答
(1)50%x-30=52        0.5x-30=52     0.5x-30+30=52+30           0.5x=82    ...
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