1.2X＋2＝X＋4
2x-x=4-2
x=2
2.2/3X－2/1X＝2/1
2/3x-6/3x=2
-4/3x=2
6x=-4
x=-2/3
3.2/1＋3/1－6/1
2+3-6=-1
4.2sinπ/2－3cosπ－sinπ/6
=2+3-1/2=9/2
2X＋2＝X＋42/3X－2/1X＝2/12/1＋3/1－6/12sin2/π－3cosπ－sin6/π有重谢!
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