共30题 用时5分钟

68-18=

49-34=

11+80=

35+51=

79-59=

99-40=

11+40=

69-20=

55-50=

24+20=

16+50=

45+20=

93-50=

37+10=

78-50=

58-6=

72-2=

38+30=

96-6=

95-2=

45-20=

78-8=

72-40=

95-70=

35+30=

19+80=

63-20=

97-20=

18+80=

87-10=