Question

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Answer 1

Bài 6:

a: -(59-3x)+39

=-59+3x+39

=3x-20

b: -(a+b+c)+(b-c)-(a-c-1)

=-a-b-c+b-c-a+c+1

=-2a-c+1

c: -(19-2x)+39

=-19+2x+39

=2x+20

d: -(a+b+c)+(b-c)-(a-c+1)

=-a-b-c+b-c-a+c-1

=-2a-c-1

Bài 5:

a: 2x+(-61)-(21-61)

=2x-61-21+61

=2x-21

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

=-3-x+5+3

=-x+5

c: 11-(13-x)+(13-11)

=11-13+x+13-11

=x

d: 25-(15-x+303)+303

=25-15+x-303+303

=x+10

e: x+(-81)-(11-81)

=x-81-11+81

=x-11

f: (-1-x+2)+1

=-1-x+2+1

=-x+2

g: 15-(11-x)+(11-15)

=15-11+x+11-15

=x

h: 15-(15-x+202)+202

=15-15+x-202+202

=x