let a=7 let b=8 let a=a-1 let b=a print a+b end
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![let a=7 let b=8 let a=a-1 let b=a print a+b end](/uploads/image/z/11452706-26-6.jpg?t=let+a%3D7+let+b%3D8+let+a%3Da-1+let+b%3Da+print+a%2Bb+end)
let a=7 let b=8 let a=a-1 let b=a print a+b end
let a=7 let b=8 let a=a-1 let b=a print a+b end
let a=7 let b=8 let a=a-1 let b=a print a+b end
12.a=a-1的意思是把a-1的值赋给a,则现在,a=6,再b=a,把现在的a赋给b,b=6.printa+b,的值为6+6,即12