Question

Вычислите и решите уравнения

Answer 1

2.

1)х=-12

2)х=-7

3)х=2

4)х=-5

6)х=7

7)х=-4

8)х=-4

9)х=5

10)х=-9

11)х=-1,3

Answer 2

Ответ:

№1

а) 4(2х - 5) - 8(х - 1) = 8х - 20 - 8х + 8 = 8 - 20 = -12

б) $3(10x + 2) - 6(5x - 11) = 30x + 6 - 30x + 66 = 6 + 66 = 72$

в) $(5x - 7) + 10(x - 2) + 3(12 - 5x) = 5x - 7 + 10x - 20 + 36 - 15x = 36 - 7 - 20 = 9$

г) $7(3x - 4) - 4(4x + 3) - 5(x - 1) = 21x - 28 - 16x - 12 - 5x + 5 = 5 - 28 - 12 = -35$

№2

1)

$-2x=24\\x=-\frac{24}{2} \\x = -12$

2)

$3x=-21\\x= -\frac{21}{3}\\x=-7$

3)

$3x - 1 = 5\\3x = 5+1\\3x = 6\\x=\frac{6}{3}\\ x=2$

4)

$-x + 6 = 11\\-x = 11 - 6\\-x=5\\x = -5$

5)

$-5x+6=-13\\-5x = -13 - 6\\-5x=-18\\5x=18\\x=\frac{18}{5} = 3\frac{3}{5} \\x=3 \frac{3}{5}$

6)

$4x-13=8+x\\4x - x=8+13\\3x = 21\\x=\frac{21}{3}\\x=7$

7)

$5x + 15 = x-1\\5x - x=-1-15\\4x=-16\\x=-\frac{16}{4} \\x=-4$

8)

$-6x+2=-x+22\\-6x+x=22-2\\-5x=20\\x=-\frac{20}{5} \\x=-4$

9)

$-4x+22=x-3\\-4x-x=-3-22\\-5x = -25\\5x=25\\x=\frac{25}{5}\\ x=5$

10)

$2(x-1) - 5=3x+2\\2x-2-5=3x+2\\2x-3x=2+2+5\\-x=7\\x=-7$

11)

$4(3x+5)-14=2(x-7)\\12x+20-14=2x-14\\12x-2x=-14+14-20\\10x=-20\\x=-\frac{20}{10}\\ x=-2$