11×9=(9+2)×9=81+11=99或者=(10+1)×9=90+9=9922×35=22×(30+5)=660+110=77033×7=(30+3)×7=210+21=231
11×9+22×35+33×7=11×9+(11×2)×35+(11×3)×7=11×9+11×(2×35)+11×(3×7)=11×9+11×70+11×21=11×(9+70+21)=11×100=1100