Mathematics
Junior High
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國二數學3-2利用十字交乘法因式分解
求解！
4. 一個質數只能分解成1與本身的乘積,例如:
3=1×3,11=1×11,若5x㎡-34x7 是一個質數,
且x為正整數,則:
(1)x之值為何?(5分)
(2)此質數應為何?(2分)上汽照国军
解】 數:
(B) 2X-3
24+5)-3(2x+5) (
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