Question

Послуги пж срочно нужна

Answer 1

1) 5(0,3x + 6) - 4(0,2x - 7) = - 5

1,5x + 30 - 0,8x + 28 = - 5

0,7x = - 5 - 58

0,7x = - 63

x = - 63 :0,7

x = - 90

2) 0,5(3x - 4) + 4,4 = 0,9(4x - 2)

1,5x - 2 + 4,4 = 3,6x - 1,8

1,5x - 3,6x = - 1,8 - 2,4

- 2,1x = - 4,2

x = 2

$3)\frac{x-2}{x-3} =\frac{7}{5}\\\\7*(x-3)=5*(x-2)\\\\7x-21=5x-10\\\\7x-5x=-10+21\\\\2x=11\\\\x=5,5\\\\\\4)\frac{x+0,3}{5}=\frac{0,2-x}{3}\\\\5*(0,2-x)=3*(x+0,3)\\\\1-5x=3x+0,9\\\\-5x-3x=0,9-1\\\\-8x=-0,1\\\\x=0,0125$

$5)\frac{2,3x-11,2}{7}=\frac{9,4-1,7x}{21}\\\\21*(2,3x-11,2)=7*(9,4-1,7x)\\\\48,3x-235,2=65,8-11,9x\\\\48,3x+11,9x=65,8+235,2\\\\60,2x=301\\\\x=5$