12乘47的积是多少？
脱式计算，能简算的要简算．① ② ③④ ⑤ ⑥15×4.6﹣46×0.5．
看谁算的又对又快．+= += ﹣= ﹣=1﹣= += ﹣= 1﹣=+= ﹣= += +=
看谁算得快．1﹣﹣﹣+0.75+++0.25+0.625．
6﹣3﹣0.625．
计算．
②
③
⑤
⑥15×4.6﹣46×0.5．
+
= 
= 
﹣
= 
﹣
=
= 
+
﹣
= 1﹣
=
+
= 
﹣
= 
+
= 
+
=
﹣
﹣
+
+
+0.25+0.625．
﹣3
﹣0.625．
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