11*22+2.2*890=110*2.2+2.2*890=2.2*(110+890)=2.2*1000=2200望采纳
11×22+2.2×890=11×22+22×89=(11+89)×22=100×22=2200
11×22+2.2×980=11×22+22×98=22×(11+98)=11×2×109=11×218=2398
11x22+22x89=(11+89)x22=100x22=2200