1. 48, 49, 50, 51, 52
2. 48 + 30 = 78, 49 + 30 = 79, 50 + 30 = 80, 51 + 30 = 81, 52 + 30 = 82
78, 79, 80, 81, 82
3. 48 - 20 = 28, 49 - 20 = 29, 50 - 20 = 30, 51 - 20 = 31, 52 - 20 = 32
28, 29, 30, 31, 32
#7
6-3х-3=7-х
-2х=4
х= -2
#8
х. -1 сторона. х+4.2. -2 сторона
х+х+4.2=14.8
2х=10.6
х=5.3. -1 сторона
5.3+4.2=9.5. -2 сторона
Площадь = 5.3*9.5=50.35
10/630=1/63
12/660=1/55
1/63<em /><1/55 следовательно,первый доберется быстрее
У÷9=28+32
у÷9=60
у=60×9
у=540
27/34 * (5 - 2 4/5 * 1 1/9) = 1,5
1) 2 4/5 * 1 1/9 = 14/5 * 10/9 = 14/1 * 2/9 = 28/9 = 3 1/9
2) 5 - 3 1/9 = 4 9/9 - 3 1/9 = 1 8/9
3) 27/34 * 1 8/9 = 27/34 * 17/9 = 3/2 = 1,5