解方程．（1）(9)/(10)x-2=(3)/(5) （2）x÷(2)/(5)=(3)/(8) （3）(2)/(5)+x=(18)/(25) （4）3x+(5)/(3)x=28．

解方程．
（1）$\frac{9}{10}$x-2=$\frac{3}{5}$   
（2）x÷$\frac{2}{5}$=$\frac{3}{8}$  
（3）$\frac{2}{5}$+x=$\frac{18}{25}$    
（4）3x+$\frac{5}{3}$x=28．

参考答案与解析：

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