Question

va rog sa raspundeti la toate si va dau coroana va rog frumos <3

Answer 1

$ex.1 \\ a)x + 0,5 < 3,5 \\ x < 3,5 - 0,5 \\ x < 3$

$b)2,5 + 2x < 8,9 \\ 2x < 8,9 - 2,6 \\ 2x < 6, 3 \\ x < 3,15$

$c)3 \times (2x - 0,5) > 4,5 \\ 2x - 0,5 > 1,5 \\ 2x > 1,5 + 0,5 \\ 2x > 2 \\ x > 1$

$ex.2 \\ a)x + 0,7 = 1,8 \\ x = 1,8 - 0,7 \\ x = 1,1$

$b)3 \times x = 15,63 \\ 3x \div 3 = 15,63 \div 3 \\ x = 5,21$

$c)(8,7 - 2x) \div 0,3 = 5 \\ ( \frac{87}{10} - 2x) \div \frac{3}{10} = 5 \\ ( \frac{87}{10} - 2x) \times \frac{3}{10} = 5 \\ 29 - \frac{20}{3} x = 5 \\ 87 - 20x = 15 \\ - 20x = 15 - 87 \\ - 20x = - 72 \\ x = \frac{18}{5}$

$ex.</strong><strong>4</strong><strong> </strong><strong>\\ a) ma = (3,2 + 0,8) \div 2 \\ ma = 4 \div 2 = > \\ ma = 2$

$b)ma = (1,16 + 3,28 + 4,26) \div 3 \\ ma = (4,44 + 4,26) \div 3 \\ ma = 8,7 \div 3 \\ ma = 2,9$

$a)segmente \: \: egale = > \\ 2 + 1 = 3 \\ b)</strong><strong> </strong><strong>un</strong><strong> \: </strong><strong> \: \: </strong><strong>segment</strong><strong> = > \\ 6,75 \div 3 = 2,25 \\ c)primu \: \: numar = > \\ 2 \times 2,25 = 4,5$