Question

Gasiti nr. natural x care verifica egalitatea :
A)x+25+75=400
B)1+2+3...+10+x=3000
C)51+(x+23)+26=100
D)1+2+3+4+x+6+7+8+9=550
E)49+x+21+230=2312
F)22+33+44+x+188+177+166=1000

Answer 1

a) x= 400- 25-75 =300
c)x=3000-51-23-26=2900
tiam explicat primele doua exemple mai departe fa singur

Answer 2

a)x+25+75=400
x=400-75-25 
x=325-25
x=300

b) 1+2+3+...+10+x=3000
10x11:2+2=3000
55+x=3000
x=3000-55=2945

c)51+(x+23)+26=100
 51+(x+23)=74
x+23=74-51
x+23-23
x=0

d)1+2+3+4+x+6+7+8+9=550
9x10:2-5+x=550
45-5+x=550
x=550-40
x=510

e) 49+x+21+230=2312
    300+x=2312
    x=2312-300
    x=2012

f) 22+33+44+x+188+177+166=1000
   630+x=1000
   x=1000-630
   x=370