用递等式计算，能简便计算的要简便计算．0.034×12.5×0.8 100.4×1.9﹣1.9×0.425.8+3.76×0.25 101×0.45．
直接写得数==========
直接写得数=== 3÷8=========
直接写出得数． 93= 8.7﹣7=÷1= 21÷7= 7×÷7×= 44÷= 75÷10%= 0.9+99×0.9=
直接写出得数．
直接写出得数．÷=+=÷=×= 1÷0.25=÷1=÷3=﹣=
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= 75÷10%= 0.9+99×0.9=
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