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①2(6%0.5y)=3(2y%1)②1/5(x+15)=1/2%1/3(x%7)③2/3x...

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解:每支笔的成本为X,依题意得: x(1+30%)=7...42/5=8余2=7余7=6余12=5余17=4余22=3余2...8÷(1-1/4-1/6-1/3)=3224、一桶油,第一...

利用Cauchy-Riemann方程即可。由题意有 au/ax=av/ay, au/aya=-av/ax, 同时又有au/ax+2av/ax=0, au/ay+2av/ay=0,四个方程联立解得 au/ax=au/ay=av/ax=av/ay=0, 故u和v皆为常数, f=u+iv是常数。

啥意思?

每支笔的成本为X,依题意得: x(1+30%)=7.8...42/5=8余2=7余7=6余12=5余17=4余22=3余2...实际数量与分率的对应.8÷(1-1/4-1/6-1/3)...

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