Question

1.Tìm x∈Z, biết:

a)461+(x-45)=387

b)-12(x-5)+7(x-3)=5

c)11-(-53+x)=97

d)-(x+84)+213= -16

Answer 1

a) 461+(x-45)=387

<=>461+x-45=387

<=>416+x =387

<=>x =387-416

<=>x =-29

Answer 2

b) -12(x-5)+7(x-3) =5

<=>-12x+60+7x-21=5

<=>-5x+39 =5

<=>-5x =5-39

<=>-5x =-34

<=>x =(-34):(-5)=6,8

Answer 3

c) 11-(-53+x)=97

<=>11+53-x =97

<=>64-x =97

<=>x =64-97=-33

Answer 4

d) -(x+84)+213=-16

<=>-x-84+213 =-16

<=>-x+129 =-16

<=>-x =-16-129=-145

<=> x =145

Answer 5

a, 461+(x-5)=387

=> 461+x-5=387

=> 416-x=387

=> x=387-416

=> x= -29

Answer 6

a, 461+(x-5)=387

=> 461+x-5=387

=> 416+x=387

=> x=387-416

=> x= -29

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