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Paula442
a fost răspuns

Afla valoarea Lui x din :
[(x-1):100+90]:10-10=0
[(x-416:4+2)-5+3]×10=2000
160:8+800:5=x:3-480:4
[(x+428:4)×2+5]×2-186=800
ajutor

Răspuns :

a)[9*(x-1)/900+(81000/900)]:10-10=0
[(9x-9+81000)/900]:10-10=0
[(9x+80991)/900]:10-10=0
(9x+80991)/90 - 10 =0
(9x+80991-90)/90=0
9x+80901=0
9x=-80901
x=-80901/9=-8989
b)[(4x-416+8)/4 -5+3]×10=2000
[(4x-408)/4-20/4+12/4]×10=2000
[(4x-408-8)/4]×10=2000
[(4x-416)/4]×10=2000
(4x-416)/2×5=2000
(20x-2080)/2=2000
2(10x-1040)/2=2000
10x-1040=2000
10x=2000-1040
10x=960
x=960/10
x=96