0.3x*20+0.3*150*10+0.1*(x-150)*10-0.2x*30=?
1个回答
0.3x×20+0.3×150×10+0.1×(x-150)×10-0.2x×30
=6x+450+x-150-6x
=(6x+x-6x)+(450-150)
=x+300
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