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X=4/33
5X:3=1又4分子1:5 5*5X=1又4分之1 *3 25X= 4分之15 X=4分之15 * 25分之1 X=20分之3
交叉相乘4.8+0.5x=6.3 0.5x=1.5 x=3
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