先找规律,再填一填.(1)110+120+130+140+150=______×______(2)220+230+240+250=______×______(3
先找规律,再填一填.(1)110+120+130+140+150=______×______(2)220+230+240+250=______×______(3)343+...
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=______×______.
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(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. 故答案为:130,5,470,2,347,5,130,7. |
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