Jawabanmu

2014-08-31T07:06:06+07:00
((a+b):2xt ) + pxl
((5+7):2x4) + 9x7
6x4 + 9x7 = 87
1 4 1
2014-08-31T08:39:41+07:00
(a+b)×t:2 + p×l
(5+7)×3:2 + 9×7
6×3+9×7
18 + 63
=81