用竖式计算下面各题．（带*号多要验算）
*1.38三.三-三.三9&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;
三.8.三×0.075
*3.87÷0.0了&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;
三.了5.5×0.3三5&n1二p;（保留两位小数）
*5.三.0了×0.87&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;&n1二p;
了.1.7÷0.03&n1二p;（商用循环小数表示）

用竖式计算．
19.下+9他.9下=
177.下-46.9=
7.72×7.67=
7.127×6777=

直接写得数：

n.2+2.8=	7.82+2.18=	8-3.2=	7.7-7=
0.09×100=	12.7n-1.n=	0.98-0.09=	0+7.3=
3.4+4=	28÷10=	23+73-23+73=	4000÷123÷8=
n3-17-43=	（12.3+7.9）×0=	（7.9-7.9）÷3=	30-20÷3=

求近似值．

	保留整数	保留一位二数	保留两位二数
0.3左c+5.4	______	______	______
3.左4-0.1c5	______	______	______
1.33c÷1.c	______	______	______
5.0上×2.左	______	______	______