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用递等式计算(能简便计算的要简便计算)35,4-12.5÷25+1.7
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35,4-12.5÷25+1.7
=35+4/10-1(2+1/2)/25+17/10
=35+4/10-25/2/25+17/10
=35+4/10-5/10+17/10
=35+16/10
=36.6
=35+4/10-1(2+1/2)/25+17/10
=35+4/10-25/2/25+17/10
=35+4/10-5/10+17/10
=35+16/10
=36.6
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