sum(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22)
a1+a2+a3+a4+a5+a6+a7+a8+a9+a10+a11+a12+a13+14+a15+a16+a17+a18+a19+a20+a21+a22

步骤：打开计算窗口：
1.目标变量为：total
2.数值表达式为：sum(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22)
3.函数群组为：ALL/总和
问题：”确定“之后显示：
  An equals sign was not found when excepted after a target variable in a COMPUTE  command
什么原因啊