Question

Afla numerele necunoscute: a)9 315 +x =10 987 x+389 =9 781, b) x-3 197 =5 142 x- 8 917 =14 320 c) 8 820-x =1 874 5 002-x =2 153.

Answer 1

a)
9215+x=10987
=> x = 10987-9215=1772

x+389=9781
=> x = 10987-389 =10598

b)
x-3197=5142
=> x= 5142+3197=8339

x-8917=14320
=> x= 14320+8917=23237

c)
8820-x=1874
=> x= 1874+8820=10694

5002-x=2153
=> x = 2153+5002= 7155