4x^2+12xy-10+9y^2-49z^2+42z+1
2007-10-07 16:38:47 · 1 個解答 · 發問者 1782543 3 in 教育與參考 ➔ 教學
1. $p +$12 = $120
$P=$120-$12
= $108
2. 1 5/6 x 1/3 -:- 4/9
=11/6 x 1/3 x 9/4
=11/8
=1 3/8
3. 2/7 -:- ( 3/5 x 1/6 )
= 2/7 -:- (1/10)
=2/7 x 10/1
=20/7
=2 6/7
4. 1 1/4 x 12
=5/4 x 12
=15
2007-10-13 06:21:07 · answer #1 · answered by S.S. 7 · 0⤊ 0⤋