負數乘除題目

👨🏻‍🏫 學術台數學

[匿名]

2007-07-20 4:34 am

a=3，b=(-3)，c=(-5)

ab加bc減2ac ab
------------------ - ----
5減(-6) c

=(?)

更新1:

ab係第二係分數上，c係第二係分線下

更新2:

係ac後嘅ab

更新3:

sor..(-6)後應該有個+a..

回答 (1)

用戶4872

2007-07-20 4:45 am

✔ 最佳答案

a = 3
b = (-3)
c = (-5)

ab+bc-2ac/5-(-6) - ab/c
= (ab + bc - 2ac)/11 - ab/c
= [(3)(-3) + (-3)(-5) - 2(3)(-5)]/11 - (3)(-3)/(-5)
= (-9+15+30)/11 - 9/5
= 36/11 - 9/5
= (180 - 99)/55
= 81/55

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