Question

Tìm x ϵ N,biết

a)22+x.5-4³=251

b)1+2³+3³-4²-x=20

c)x-4300-(5250:1050:250)=4250

d)460-85.4=(x+200):4

e)4.120+[45:9+15.(x+1)]=500

Các bạn giúp mình nha thanks

Answer 1

a: \(\Leftrightarrow5x-42=251\)

=>5x=293

hay x=293/5

b: \(\Leftrightarrow20-x=20\)

hay x=0

c: \(\Leftrightarrow x-4300-\dfrac{1}{50}=4250\)

\(\Leftrightarrow x=\dfrac{427501}{50}\)

d: =>(x+200):4=460-340=120

=>x+200=480

hay x=280

e: =>5+15(x+1)=500-480=20

=>15(x+1)=15

=>x+1=1

hay x=0