问题
填空题
按规律填数.
①4000,3700,______,______,2800,2500.
②3000,3030,3070,3120,______,______,3330.
答案
①3700-300=3400;
3400-300=3100;
②3120+60=3180;
3180+70=3250.
故答案为:3400,3100,3180,3250.
按规律填数.
①4000,3700,______,______,2800,2500.
②3000,3030,3070,3120,______,______,3330.
①3700-300=3400;
3400-300=3100;
②3120+60=3180;
3180+70=3250.
故答案为:3400,3100,3180,3250.