写作:________ 写作:________ 写作:________
读作:________ 读作:________ 读作:________
鸡比鸭________ 鸭比鹅________
鹅比鸭________ 鹅比鸡________
________<________<________<________
7+70= 66-6= 45-5= 20+9=
44-40= 76-6= 30+5= 50+7=
6+20= 93-90= 4+80= 83-3=
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