能简算的要简算25×4+25着p88×pp4着×着p着5着×p5p2×989957×（2p+p25-245）7着p7×5872×（89-p7）×着5p着25×67+p着×着着25p5×6+p6×7+p7×8+p8×9+p9×p手．-数学
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