(let ((x 2) (y 5))

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/05 18:57:04

(let ((x 2) (y 5))
(let* ((x 6)(z (+ x y)))
(* z x)
(display z)
(newline);
)
(display x)
(newline)
(display y)
)

ls还汇编呢.scheme就是一种专门的语言,运算符号是在变量前面的,比如（* z x) 就是z * x,display是显示,newline是另起一行,let是定义,这样说了应该能看懂了吧.

数学(x-y)^5*(y-x)^3*(x-y)^2 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) （X+2Y)(5X-2Y) (2X-3y)-(5x-y) 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y [(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x) [(x+2y)^2 -(x+y)(3x-y)-5y^2]÷2x 2(2x+3y)(3x+2y)-(6x-y)(2x-5y) 化简：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x (2x -y)(3x-2y)+(y-x)(2x-5y) (2x-y)(3x-2y)+(y-x)(2x+5y)