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JulijaS [17]
3 years ago
9

Умоляю помогите

Mathematics
1 answer:
Liula [17]3 years ago
6 0

ответы:

№1

а) 0

б) a+b

в) -3b-7

г) 2b-10

№2

а) -3x-2

б) -5y-8

в) 5x-27

г) -10y+24

№3

а) x=5

б) y=2

в) a=3

г) x=-1

№4

-63d-84

Пошаговое объяснение:

2x-(2x + y) + y

=2x-2x-y+y

=0

-\:a\:+\:\left(2a\:-\:b\right)\:+\:2b\:

=-a+2a-b+2b

=a-b+2b

=a+b

7-\left(b+14\right)-2b

=7-b-14-2b

=-3b-7

3b-\left(18+b\right)+8

=3b-18-b+8

=2b-10

2\left(3-x\right)-\left(8+x\right)

=6-2x-\left(8+x\right)

=6-2x-8-x

=-3x-2

-4\left(y+5\right)+\left(12-y\right)

=-4\left(y+5\right)+12-y

=-4y-20+12-y

=-5y-8

-\left(7-x\right)+4\left(x-5\right)

=-7+x+4\left(x-5\right)

=-7+x+4x-20

=5x-27

-9\left(y-4\right)-\left(12+y\right)

=-9y+36-\left(12+y\right)

=-9y+36-12-y

=-10y+24

3x-5x=-13+3

-2x=-13+3

-2x=-10

\frac{-2x}{-2}=\frac{-10}{-2}

x=5

-5y-17y=-50+6

-22y=-50+6

-22y=-44

\frac{-22y}{-22}=\frac{-44}{-22}

y=2

a-12a=-6-27

-11a=-6-27

-11a=-33

\frac{-11a}{-11}=\frac{-33}{-11}

a=3

-27x-33x=-12\left(-5\right)

-60x=-12\left(-5\right)

-60x=12\cdot \:5

-60x=60

\frac{-60x}{-60}=\frac{60}{-60}

x=-1

-12\left(7-2d\right)-9\left(7d-5\right)-3\left(15+8d\right)

=-84+24d-9\left(7d-5\right)-3\left(15+8d\right)

=-84+24d-63d+45-3\left(15+8d\right)

=-84+24d-63d+45-45-24d

=24d-63d-24d-84+45-45

=-63d-84+45-45

=-63d-84

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