我想問一條maths題!

(50%x50%)+100%-200%/6

=25%+100%-200%/6

=125%-200%/6

= -75%/6

= -12.5%
hi

先乘除后加减,

(50% x 50%) + 100% - 200% / 6
= 25% + 100% - 33.33%
= 91.67%

^^~~ (-12.5% )

91 2/3%

(50%x50%)+100%-200%/6
=25%+100%-33 1/3% -->先乘除後加減
=125%-33 1/3%
=91 2/3%

如果你不熟百分數的計法, 可以用分數的方法去計
(50%x50%)+100%-200%/6
=(1/2 x 1/2)+1-(2/6) --> 化為分數
=1/4 + 1 - (1/3)
=(5/4) - (1/3)
=[(15-4) / 12] --> 通分母
=11/12
=91 2/3% --> 最後化回百分數

方法雖然不同, 但只要算式無錯, 答案都會一樣的
道理同出街一樣, 可以走路, 乘車, 坐MTR
只要無上錯車, 目的地都會一樣
熟能生巧, 做多D你便會知道那個方法對你最好, 最快^^
祝你新一年 學業進步!!!

(50%x50%)+100%-200%/6
=25%+100%-33 1/3%
=91 2/3%

-12.5%