计算，能简算的要简算．0.32×2.5×12.5 3.6×0.81+0.36×1.9 4.05÷[1.8×（3.36﹣2.86）]．
算一算：×3=×5=×8=×26=×7=×5=×12=×3=×34=×200=×0=×1=
计算 21×=×26=×=×15×=
的7倍是多少？
的倒数与的积是多少？
== 8×=
×3=
×5=
×8=
×26=
×7=
×5=
×12=
×3=
×34=
×200=
×0=
×1=
=
×26=
×
=
×15×
=
的7倍是多少？
的倒数与
的积是多少？
=
=
=
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