Gross profit for 20X3 can be calculated from:
A: Purchases for 20X3, plus inventory at 31 December 20X3, less inventory at 1 January 20X3
B: Purchases for 20X3, less inventory at 31 December 20X3, plus inventory at 1 January 20X3
C: Cost of goods sold during 20X3, plus sales during 20X3
D: Net profit for 20X3, plus expenses for 20X3
A: Purchases for 20X3, plus inventory at 31 December 20X3, less inventory at 1 January 20X3
B: Purchases for 20X3, less inventory at 31 December 20X3, plus inventory at 1 January 20X3
C: Cost of goods sold during 20X3, plus sales during 20X3
D: Net profit for 20X3, plus expenses for 20X3
举一反三
- X为随机变量，E（X）=-1，D（X）=3，则E{3（X^2）+20}=（）？ A: 18 B: 9 C: 30 D: 32
- 作业3：计算分段函数的值[br][/br] -1 (x<0) y= 0 (0<=x<10) 1 (10<=x<20) 20 (20<=x) 请给出运行结果截图。
- 3(<em>x</em>-10)=5(<em>x</em>+20),<em>x</em>=______. A: -65 B: -50 C: -35 D: -20 E: -15
- X为随机变量，E(X)=-1，D(X)=3，则E(3[img=24x22]1803da40b5dbfd6.png[/img]+20)=( ) A: 18 B: 9 C: 30 D: 32
- X为随机变量，E(X)=-1，D(X)=3，则E(3[img=24x22]1803da40ac7a8ce.png[/img]+20)=( ) A: 18 B: 9 C: 30 D: 32