coloana 1 )
495×345+2978=173 753
620×345+2978=216 878
504×345+2978=20 228
278×345+2978=98 888
380×345+2978=134 078
709×345+2978=247 583
coloana 2 )
408×495-5899=196 061
408×620-5899=247 061
408×504-5899=199 733
408×278-5899=107 525
408×380-5899=149 141
408×709-5899=283 373
