用递等式计算（注意简算）25+19÷89-38849÷[98×（18+37）]（309×17+375）÷843.35×6.4×2+6.7×3.6．
用递等式计算（注意简算）25+19÷89-38849÷[98×（18+37）]（309×17+375）÷843.35×6.4×2+6.7×3.6．...
用递等式计算（注意简算）25+19÷89-38849÷[98×（18+37）]（309×17+375）÷843.35×6.4×2+6.7×3.6．
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（309×17+375）÷84
=（5253+375）÷84
=5628÷84
=67；
3.35×6.4×2+6.7×3.6
=6.7×6.4+6.7×3.6
=（6.4+3.6）×6.7
=10×6.7
=67．
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