20+833-6 68-868-(5-3) 5元3角53分
-30=70 65-=60 4+=70
+15=45 +23=78 90-=54
A.19颗
B.45颗
C.37颗
83-16= 72-57= 36+54= 14+29=
27+58= 9+66= 84-38= 90-3=
55+38= 66+14 = 63-36= 100-27=