`b=${b}` "X" equals left parenthesis, 1 , "b" plus 1 , right parenthesisX=1,b+1
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equals=
left parenthesis, 1 , 2.6 2 , right parenthesis1,2.62
5
表达式6: "b" "x" plus "c"bx+c
6
表达式7: polygon left parenthesis, left parenthesis, 0 , 1 , right parenthesis , left parenthesis, "X" . "x" , 1 , right parenthesis , "X" , right parenthesispolygon0,1,X.x,1,X
