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Math problems in the third grade of primary school are regular.
1×9+2= 1 1

12×9+3= 1 1 1

( 123)×9+(4)= 1 1 1 1

( 1234)×9+(5)= 1 1 1 1 1

( 12345)×9+(6)= 1 1 1 1 1 1

( 123456)×9+(7)= 1 1 1 1 1 1 1

( 1234567)×9+(8)= 1 1 1 1 1 1 1 1

( 12345678)×9+(9)= 1 1 1 1 1 1 1 1 1

Hope to adopt ~ ~

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