Математика 3 класс. Задание: Вычисли рационально.  1. ) 11+22+33+44+66+77+88+99 =?

2. ) ( 350+105+250) - (111+28+459 ) = ?

3. ) ( 450+20+50 ) + ( 450-20-50 ) = ?

4. ) ( 45+12+95 ) - ( 91+42+19 ) = ?
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