Question

[Lại Mai Trang]

Tìm x thuộc Z:

a)x/5-2/3+3/4=17/60

b)1/8-7/5-2/x=-223/120

Answer 1

[Nguyễn An Bình]

a) 

x/5-2/3+3/4=17/60

<=> x/5=17/60-3/4+2/3

<=> x/5=1/5

<=> x=1

Answer 2

[Nguyễn An Bình]

b)

18−75−2x=−22312018−75−2x=−223120  

<=> −5140−2x=−223120−5140−2x=−223120

<=>2x=−5140+2231202x=−5140+223120

<=>2x=7122x=712 <=> 7x=2.127x=2.12

                             <=> x=247x=247

vậyx=247