41. 1) 9/24 и 4/24 2)8/18 и 15/18 3) 4/18 и 5/18 4) 20/40 и 15/40 5) 15/36 и 14/36 6) 35/50, 25/40 и 10/40
На 7:
25*4 = 100
100 - 93 = 7
Ответ:
Пошаговое объяснение:
284)
1) 18 7/13 : 10 1 /24 = 241/13 * 24/241 = 24/13 = 1 11/13
2) 2 11/13 - 1 11/13 = 1
3) 1 : 15/62 = 62/15 = 4 2/15
4) 4 2/15 - 2,4 = 4 2/15 - 2 2/5 = 4 2/15 - 2 6/15 = 1 11/15
ответ: 1ц. 11/15
=====================================================
285)
(10 - 7,7)*x = (2,8+8,7)* 2 3/5
2,3x = 11,5 * 2,6
2,3x = 29,9
x = 29,9 : 2,3
x = 13
19*42-42*16+16*40-40*13+13*38-13*10+10*36-36*7=
=42(19-16)+40(16-13)+13*(13-10)+36(10-7)=42*3+40*3+13*3+36*3=
=3*(42+40+13+36)=3*131=393