Question

Tìm X biết:

a) 770 : [ ( 20X + 10 ) : X ] = 35

b) 5X + 15 - 2X = 65

Answer 1

a, Ta có:   770:[ ( 20x+10 ):x ] = 35

=>(20x+10):x =770:35

=>(20x+10):x =22

=>20x+10=22x

=>20x+10=20x .2x

=>10=2x

=>x=10:2

=.x=5

b,Ta có:   5x+15-2x=65

=>5x-2x+15=65

=>3x+15=65

=>3x=50

x=50/3

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Answer 2

b, 5x+15-2x=65

=>5x-2x+15=65

=>3x+15=65

=>3x=50

=>x=50/3