Округлите десятичные дроби:
1) 7,3605; 0,9421; 3,1502; 12,0374; 9,5601 до десятых;
2)0,2831; 4,0376; 19,6201; 3,4057; 6,4817 до сотых;
3) 0,67509; 4,23265; 8,98605; 29,48075 до тысячных;
Упростите выражение
1,8x-0,5x+2,7x-2,3x
0,7y+1,2y
3(x+5)+2x
9(в+2)-7
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