列竖式计算．7.5﹣4.8 15.6+7.7 3.2﹣2.327.8+23.5 30﹣13.4． 17.4+29.6．
18×+12×0.25+10×25%
+6.28+﹣4.28．
神机妙算细又巧！（写出简算过程）×9+（+）×15×17×12﹣÷×+×+．
×3.6+×0.75．
脱式计算．能简算的要简算 1.26÷0.4÷31.5 18﹣（+）×1051.25×32×0.25．
+12×0.25+10×25%
+6.28+
﹣4.28．
×9+
（
+
）×15×17
×12﹣
×
+
×
×3.6+
×0.75．
+
）×1051.25×32×0.25．
粤公网安备 44130202000953号