(好似話係中學-3-)代數問題．．．入黎幫手教下我做~10點!!!!

(一)化簡下列代數式。
(a)題~(2m+5/2)-(m-1/4)

(2m + 5/2) - (m - 1/4)

= (4m/2 + 5/2 ) -(4m/4 - 1 /4) 通分母

= (4m +5) (4m - 1)
______ - ______
2 4


= 8m + 10 4m-1
_______ - ____
4 4 通分母


= 8m+10 -4m+1 注意 -1要變+1 因為( 4m-1)/4 前要係負號
____________
4

= 4m+11
______
4

(b)題~6x(2a+7/3)+4x(3a-5/2)

6x(2a+7/3)+4x(3a-5/2)

= 6 x 2a + 6 x 7/3 +4x3a -4x5/2 除括口

= 12a + 14 +12a - 10
=24a +4