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Afla numărul x.a)214 + x=5003 823 -×=597 ×-198=5718 b)x×5=85 ×:8=165 90:×=9 c)12:×=16:8 x×10=80:2 ×+×=245+×

Răspuns :

a)
214 + x=5003         x=5003-214=4789
823 -x=597             x=823-597=226
x-198=5718            x=5718+198=5916
b)
x×5=85                    x=85:5=17
x:8=165                   x=165×8=1320
90:x=9                     x=90:9=10

c)
12:x=16:8             
12:x=2           x=12:2=6
x×10=80:2             
x×10=40      x=40:10=4        
x+x=245+x            
2x=245+x    2x-x=245        x=245