一條有向數的題目(急!!!!!!!!!!)

回答 (2)

2010-09-17 1:49 am

✔ 最佳答案

(+11)-(-2)x〔(+6)÷(-3)+(-2)〕

= 11 - ( -2 ) x [ ( -2 ) + ( -2 ) ]

= 11 - ( -2 ) x ( -4 )

= 11 - ( +8 )

= 11 - 8

= 3

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〔(-5)(-2)-(+3)(+4)〕÷〔(-6)+(-4)〕x(+2)

= [ ( +10 ) - ( +12 ) ] ÷ [ ( -6 ) - 4 ] x ( +2 )

= [ ( +10 ) - 12 ] ÷ ( -10 ) x ( +2 )

= ( -2 ) ÷ ( -10 ) x ( +2 )

= 0.2 x ( +2 )

= 0.4

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** ( -a ) ( -b ) = ( +ab ) = ab **

** ( +a ) ( -b ) = ( -b ) ( +a ) = ( -a ) ( +b ) = ( +b ) ( -a ) = ( -ab ) **

** ( +a ) ( +b ) = ( +ab ) = ab **

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Hope this can help you

參考: Hope I Can Help You^_^

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Jon

2010-09-17 1:44 am

(+11)-(-2)x〔+6)÷(-3)+(-2)〕 = 11 - (-2) x ( -2 -2)

= 11 -(-2) x (-4)

= 11- 8

= 3

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