748-351+252-149 用地等式怎样简便就怎样算

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748-351+252-149 用地等式怎样简便就怎样算
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748-351+252-149 用地等式怎样简便就怎样算
748-351+252-149 用地等式怎样简便就怎样算

748-351+252-149 用地等式怎样简便就怎样算
748-351+252-149
=(748+252)-(351+149)
=1000-500
=500

=(748+252)-(351+149)
=1000-500
=500

748+252-(351

748+252一(351+149)=900一500=400

哥,748+252-(351+149)就等于1000-500

748+(252-351-149)=748-248=500

748 +252-(149+351)