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数加减法150个+= 2-= += -= +=
-= += -= 2+= +=
-= -= += -= 1-=
+= 1-= -4= +4= +=
10-= 6+= -= 1-= +=
7+= += += += 1-=
+1= -= 10-= 14+= 3+=
5-= += -1= -= +=
+= += -= += -=
- = += += 88-= 1-=
-105= += -= -11= +=
+= += += += +=
+= + = + = += +=
+14= 6+= += += +=
+= + = += - = -=
-= += += -= +=
-= 6+= -= -= +=
+= += += += +=
-= += += += +=
+= += += += -=
+= += += += +=
+= += + = += + =
-= -= += 42+= +=
+= += + = -=
+= -= += += +=
+ = += -= -= +=
+= -= -= += -=
+= += +=
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