Jawapan

2016-05-08T08:40:16+08:00
(15.489 + 35.865)+5.769-68.64
=(51.354+5.769)-68.643
=57.123-68.643
= -11.52
2016-05-08T09:59:32+08:00
  15.489
+35.865
-----------
  51.354
-----------

  51.354
+  5.769
-----------
  57.123
-----------

   57.123
- 68.643
-----------
- 11.520
-----------

Jawapannya -11.52. Tekan-tekan kalkulator senang lagi ;)