运算顺序与几何作图示例

GeoGebra 命令及参数

1. Random(0, 9) → num1
2. Random(0, 9) → num2
3. Random(0, 9) → num3
4. Random(0, 5) → exp1
5. If((num2 ≠ 0) ∧ (num3 ≠ 0), "" + num1 + (Sum[Sequence[" + " + num2, k, 1, num3]]), "" + num1 + " + 0") → eqn2
6. FractionText(1.6666666666666667) → text01
7. TableText({{"Subtraction is the same as Addition: "}, {(((((((num1 * " - ") * num2) * "\; is\; the\; same\; as\; ") * num1) * " + (-") * num2) * ")")}}) → example2
8. TableText({{("Dividing\; 5\; by\; 3\; is\; the\; same\; as\; the\; fraction " * text01)}, {"Hence, multiplying by the fraction represents division"}}) → example1
9. If((num1 ≠ 0) ∧ exp1 ≟ 0, "1", If[num1 ≟ 0 ∧ (exp1 ≠ 0), "0", If[(num1 ≠ 0) ∧ exp1 ≟ 1, "" + num1, If[num1 ≟ 0 ∧ exp1 ≟ 0, "Undefined", If[(num1 ≠ 0) ∧ (exp1 ≠ 0), "" + num1 + (Sum[Sequence[" x " + num1, k, 1, exp1 - 1]])]]]]) → eqn4
10. If(num1 ≟ 0 ∧ eqn1 ≟ 0, "UNDEFINED", eqn4 + " x " + num2 + " + " + num3) → eqn4_1
11. Polygon(Corner[1], Corner[2], Corner[3], Corner[4]) → discus_{poly}, a, b, c, d