Question

calculeaza si fa proba prin operatia inversa. a)2361+3217= 4891-2230= b)4703+3897= 3862-1641=c)3895+4305= 7000-2831=

Answer 1

a)2361+3217=5578 (5579-23(61=3217 , 5578-3217=2361)
4891-2230=2661(2661+2230=4891  ,  2661-4891=-2230)
b)4703+3897=8600(8600-4703=3897  ,  8600-3897=4703)
3862-1641=2221(2221+1641=3862  ,  2221-3862=-1641)
c)3895+4305=8200(8200-3895=4305  ,8200-4305=3895)
7000-2831=4169(4169+2831=7000 , 4169-7000=-2831)

a) 5578=2661
b)8600=2221
c)8200=4169