Question

ПОМОГИ ПЖ НОМЕР 1
ОТ 1 ДО 4 СДЕЛАЙТЕ ПЖ
ДАМ 40 БАЛОВ
7 КЛАСС АЛГЕБРА​

Answer 1

2.17 + (3.2 - 0.17) = 2.17 - 0.17 + 3.2 = 2 + 3.2 = 5.2

9.49 - (1.5 + 0.99) = 9.49 - 0.99 - 1.5 = 8.5 - 1.5 = 7

13 7/9 - (2.64 + 2 7/9) = 13 7/9 - 2 7/9 - 2.64 = 11 - 2.64 = 8.36

6 7/8 - (3.14 - 2 1/8) = 6 7/8 + 2 1/8 - 3.14 = 9 - 3.14 = 5.86

Answer 2

1)

$2,17 + (3,2-0,17) = 2,17 + 3,03 = 5,2$

2)

$9,49 - (1,5+0,99) = 9,49 - 2,49 = 7$

3)

$13\frac{7}{9} - (2,64+2\frac{7}{9}) = \frac{124}{9} - (\frac{66}{25} + \frac{25}{9}) = \frac{124}{9} - \frac{1219}{225} = \frac{3100}{225} - \frac{1219}{225} = \frac{1881}{225} = \frac{209}{25} = 8\frac{9}{25} = 8,36$

4)

$6\frac{7}{8} - (3,14-2\frac{1}{8}) = \frac{55}{8} - (\frac{157}{50} - \frac{17}{8}) = \frac{55}{8} - \frac{203}{200} = \frac{1375}{200} - \frac{203}{200} = \frac{1172}{200} = \frac{293}{50} = 5\frac{43}{50} = 5,86$