Jawabanmu

2014-09-03T13:19:59+07:00
Rumus:
+ : + = +
-  : + = -
+ : -  = -
-  : -  = +

keterangan: + = positif, - = negative.
1 5 1
2014-09-03T13:20:20+07:00
+×+=+
-×-=+
+÷+=+
-÷-=+
-×+=-
-÷+=-