计算，怎样算简便就怎样算
102×（4.5÷0.09）         19.96×5.4﹣4.4×19.96                3.8+2.49+7.51+4.2
2.3+3.91÷（22﹣19.7）    （1﹣0.2）×[13﹣（3.12+5.28）]        9.9×1.45．