99.66×6+66.98×18=22.2×3×9+22.2×23=22.2×27+22.2×23=22.2×(27+23)=22.2×50=1110
=22.2×3×9+22.2×23=22.2×27+22.2×23=22.2×(27+23)=22.2×50=1110