先找规律,再填一填.
(1)110+120+130+140+150=______×______
(2)220+230+240+250=______×______
(3)343+345+347+349+351=______×______
(4)115+120+125+130+135+140+145=______×______.
先找规律,再填一填.(1)110+120+130+140+150=______×______(2)220+230+240+250=______×______(3)34
答案:2 悬赏:0 手机版
解决时间 2021-01-04 07:03
- 提问者网友:半生酒醒
- 2021-01-03 14:47
最佳答案
- 五星知识达人网友:渊鱼
- 2021-01-03 15:32
解:(1)110+120+130+140+150,
=110+120+130+(130+10)+(130+20),
=(110+20)+(120+10)+130+130+130,
=130×5;
(2)220+230+240+250,
=(220+250)+(230+240),
=470+470,
=470×2,
(3)343+345+347+349+351,
=343+345+347+(347+2)+(347+4),
=(343+4)+(345+2)+347+347+347,
=347×5,
(4)115+120+125+130+135+140+145,
=115+120+125+130+(130+5)+(130+10)+(130+15),
=(115+15)+(120+10)+(125+15)+130+130+130,
=130×7.
故
=110+120+130+(130+10)+(130+20),
=(110+20)+(120+10)+130+130+130,
=130×5;
(2)220+230+240+250,
=(220+250)+(230+240),
=470+470,
=470×2,
(3)343+345+347+349+351,
=343+345+347+(347+2)+(347+4),
=(343+4)+(345+2)+347+347+347,
=347×5,
(4)115+120+125+130+135+140+145,
=115+120+125+130+(130+5)+(130+10)+(130+15),
=(115+15)+(120+10)+(125+15)+130+130+130,
=130×7.
故
全部回答
- 1楼网友:平生事
- 2021-01-03 16:50
我明天再问问老师,叫他解释下这个问题
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