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國二數不會
Sep 6th 2013, 12:11

97 x 103 - 104 x 96
= ( 100 - 3 ) ( 100 + 3 ) - ( 100 + 4 ) ( 100 - 4 )
= ( 10000 - 300 + 300 - 9 ) - ( 10000 + 400 - 400 -16 )
= 9991 - 9984
= 7

A : 7

( a + b ) ( c + d ) = a ( c + d ) + b ( c + d ) = ac + ad + bc + bd

→ → → →
↓ 　↓ 　↓
即 ( a + b ) ( c + d ) = ac + ad + bc + bd
　　↑　　 ↑　 ↑　
　 → → → → → →

不知道這樣打是否有加深您的印象呢 ~?

參考資料： 我自己親手算 + 看國 2 數學課本參考

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