Question

Dau coroana și 5 stele va rog​

Answer 1

a)5×(2x-1)=15

2x-1=15:5

2x-1=3

2x=3+1

2x=4

x=4:2

x=2

5×(2×2-1)=15

b)6×(3x+9)=-72

3x+9=-72:6

3x+9=-12

3x=-12-9

3x=-21

x=-21÷3

x=-7

6×(3×(-7)+9)=-72

c)-9(6x+4)=180

6x+4=180÷(-9)

6x+4=-20

6x=-20-4

6x=-24

x=-24÷6

x=-4

-9×(6×(-4)+4)=180

d)10(-8x+7)=-170

-8x+7=-170÷10

-8x+7=-17

-8x=-17-7

-8x=-24

x=-24÷(-8)

x=3

10×(-8×3+7)=-170

e)-20(-9x-11)=-500

-9x-11=-500÷(-20)

-9x-11=25

-9x=25+11

-9x=36

x=36÷(-9)

x=-4