234*123123-122*234234怎么简便

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234*123123-122*234234怎么简便
234*123123-122*234234怎么简便

234*123123-122*234234怎么简便
234x123123-122x234234=234x123x1001-122x234x1001=234x1001x(123-122)=234x1001=234234

原式=234*1001*123-122*1001*234
=234*1001*(123-122)
=234234