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公式 和代入法
變數 未知數 常  數 符號的值有待求出 可以變動數值的符號 不可以變動數值的符號
+ x = 8 = x 4 A 未知數 變數 常數 ? 未知數 變數 常數
+ y = 1 = y 8 B 2 未知數 變數 常數
z = = z 3 n 4 未知數 變數 + 0 常數
A = = A 1 C 未知數  : 變數  : + 4 常數  : 2 = B 4 , B 3 + C A B 4
x = = x 2 z 未知數  : 變數  : 4 常數  : = y 3 , y z x y -4
b = = a 2 d 未知數  : 變數  : 1 常數  : = b 3 , c d a b -1 = c 4 , -2 a + 3 c
x = = x 50 A 16 (50) = A 16 = 34
B = = B 2 A 3 (2) = 6 = A 3
x = = x 4 6 = y 5 , z 2 + 3 y (5) (4) = 6 2 + 3 = 6 8 + 15 = 17
a = = a 15 1 = r 6 , s r (6) (15) 1 = 3 = = 5 15
= = c 2 T (2) c 2 3 = 1 = 2 3 = 3 4
= = B 4 C (4) B 2 2 = 32 = 2 2 (16) = 2
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  1. 1. 公式 和代入法
  2. 2. 變數 未知數 常 數 符號的值有待求出 可以變動數值的符號 不可以變動數值的符號
  3. 3. + x = 8 = x 4 A 未知數 變數 常數 ? 未知數 變數 常數
  4. 4. + y = 1 = y 8 B 2 未知數 變數 常數
  5. 5. z = = z 3 n 4 未知數 變數 + 0 常數
  6. 6. A = = A 1 C 未知數 : 變數 : + 4 常數 : 2 = B 4 , B 3 + C A B 4
  7. 7. x = = x 2 z 未知數 : 變數 : 4 常數 : = y 3 , y z x y -4
  8. 8. b = = a 2 d 未知數 : 變數 : 1 常數 : = b 3 , c d a b -1 = c 4 , -2 a + 3 c
  9. 9. x = = x 50 A 16 (50) = A 16 = 34
  10. 10. B = = B 2 A 3 (2) = 6 = A 3
  11. 11. x = = x 4 6 = y 5 , z 2 + 3 y (5) (4) = 6 2 + 3 = 6 8 + 15 = 17
  12. 12. a = = a 15 1 = r 6 , s r (6) (15) 1 = 3 = = 5 15
  13. 13. = = c 2 T (2) c 2 3 = 1 = 2 3 = 3 4
  14. 14. = = B 4 C (4) B 2 2 = 32 = 2 2 (16) = 2

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