脱式计算（能简算的要简算）×+× 2012× （+）÷+ 25×125×1.6．
递等式计算+=+=﹣=﹣= 1﹣=+﹣= 1﹣+．
直接写出得数．===== 1﹣=
．
25×8= 8.5﹣3.7= 0.56÷0.07= 4×9.2×0.25======
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