列竖式计算并且验算．517÷5306÷3．
用简便方法计算．0.6+7.91+3.4+0.09 ×3+×8﹣．
脱式计算（能简便计算的要简算）10.28+0.98+79.72+10.02 2700×（506﹣499）÷900×4.8．
计算下面各题，能简算的要简算．3.85×2.77+0.723×38.5 ×25%+×（5.7×2.8+4.3×2.8）×2.5 [10一（5+×2.4）]÷0.05．
用简便方法计算下面各题．23.5﹣（23.5﹣9.36）12.4×1.25﹣4.4+125%7.5×25+1.5×25.75+25.75．
用简便方法计算．（写出主要过程）3.625+2+4+0.375×7+0.25×3．
×3+
×4.8．
×25%+
×
×2.4）]÷0.05．×25%+××2.4）]÷0.05．
+1.5×25.75+25.75．
+4
+0.375
×7
+0.25×3
．
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