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a)9×(x-7)=-63
b)5×(x+3)=3×(x-5)
c)2×(-x+4)=-3×(x+1)+23
d)1-2×[3-(4-x)]=-7
e)2×(x+6)-5-3×x)=2×(-x+9)+3
f)325:(x-3)=-15

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Răspuns :

Alexandra221004ask

a) 9(x-7)=-63

9x-63=-63

9x=-63+63

9x=0

x=0

b) 5(x+3)=3(x-5)

5x+15=3x-15

5x-3x=-15-15

2x= -30

x= -15

c) 2(-x+4)=-3(x+1)+23

-2x+8=-3x-3+23

-2x+8=-3x+20

-2x+3x=20-8

x= 12

d) 1-2[3-(4-x)]=-7

1-2(-12+3x)=-7

1+24-6x=-7

25-6x=-7

-6x=-7-25

-6x=-32

x= 32/6

x= 16/3

e)2[(x+6)-5-3x)]=2(-x+9)+3

2(-5x-30-3x)=-2x+18+3

2(-8x-30)=-2x+21

-16x-60=-2x+21

-16x+2x=21+60

-14x=81

x= 81/-14

x= -81/14

f)325:(x-3)=-15

x-3=-15×325

x-3=-4875

x=-4865+3

x= -4862

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