Ответ учителя по предмету Математика
1)6 1/2 : 1 6/7 = 13/2 : 13/7 = 13/2 × 7/13 = 7/2 = 3 1/2;
2)6 2/3 : 2 7/9 = 20/3 : 25/9 = 20/3 × 9/25 = 12/5 = 2 2/5;
3)5 3/11 : 2 7/11 = 58/11 : 29/11 = 58/11 × 11/29 = 2/1 = 2;
4)5 5/14 : 2 1/7 = 75/14 : 15/7 = 75/14 × 7/15 = 5/2 = 2 1/2;
5)5 1/3 : 3 5/9 = 16/3 : 32/9 = 16/3 × 9/32 = 3/2 = 1 1/2
6)6 2/5 : 1 7/9 = 32/5 : 16/9 = 32/5 × 9/16 = 18/5 = 3 3/5.
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1) (-7) + (+4) + (-5) + (+3) + (-2) + (+5) =
2) (-5) + (-3) + (+4) + ( -8) + (-10) =
3) (+3) + (-8) + (-2) + (+5) + (-4) + (+9)=
4) х + (-2) = 5
Срочно!!! Даю 20 баллов!
а) 3а2 – 9аb ;
б) х3 – 25х