Question

Dau coroana . exerciți 13 va rog mult . măcar o parte

Answer 1

a)-4-{6-[-3+(-3)+(-5-x)-7]-9}=1
-4-[6-(-6-5-x-7)-9]=1
-4-(6+6+5+x+7-9)=1
-4-10-x=1
-x=1+14
x=(-15)

b)7x-7=6-3(x+1)
7x-7=6-3x-3
10x=10
x=1

c)3x-4=x+2(x-2)
3x-4=x+2x-4
3x-4=3x-4
0=0

d)x(x+1)=x²+2x+1
x²+x=x²+2x+1
-x=1
x=(-1)

e)2(2x-5)=4(x-2)-6
4x-10=4x-8-6,ecuatie,incompatibila

f)5(1-2x)+1=4(x+3)+8
5-10x+1=4x+12+8
-10x-4x=20-6
-14x=14
x=(-1)

g)-10{-2-2[(-4)⁵:4⁴-2]}=-2x
-10{-2-2[(-1024):256-2]}=-2x
-10[-2-2(-6)]=-2x
-10(-2+12)=-2x
(-100)=-2x
x=50